Early American citizenship was defined inconsistently by individual states.

Ratified in 1868, the 14th Amendment guaranteed citizenship to all people born in the United States and required states to provide equal legal protection to all.

Native Americans were not granted US citizenship until 1924

The Indian Citizenship Act granted citizenship to all Native Americans born in the US, more than 130 years after the Constitution's ratification. Even then, some states continued to deny Native Americans the right to vote for decades.

Birthright citizenship is the principle that a person acquires citizenship by being born within a country's territory, regardless of parental nationality or immigration status.

The 14th Amendment aimed to guarantee citizenship for formerly enslaved people

The 14th Amendment was crafted to overturn Dred Scott by granting birthright citizenship to formerly enslaved people and their descendants, securing their legal status under federal law.

The Nationality Act of 1790 restricted new citizenship to 'free white persons'

The first federal citizenship law limited naturalization to white immigrants, excluding enslaved people, Indigenous communities, and most non-Europeans.

Birthright citizenship guarantees US citizenship to anyone born on US soil

Rooted in the 14th Amendment, birthright citizenship prevents the creation of a permanent noncitizen class by granting citizenship at birth, but it has become a focal point of modern political efforts to restrict immigration.

Voting rights expanded from 6% of Americans in 1789 to nearly all adult citizens today.

Unconditional birthright citizenship is rare outside the Americas.

An 1898 Supreme Court case confirmed birthright citizenship for children of immigrants

In 1898, the Supreme Court ruled that the 14th Amendment guaranteed US citizenship to Wong Kim Ark, born in San Francisco to Chinese immigrants—establishing a lasting precedent for birthright citizenship regardless of parental status.

The Constitution included compromises that still shape the US today

The creation of the Constitution necessitated numerous compromises to accommodate the diverse interests of the states. The significant compromises included resolutions on debates over representation in Congress and the status of enslaved individuals.

The Dred Scott decision denied citizenship to people of African descent

In 1857, the Supreme Court ruled in Dred Scott v. Sandford that Black Americans could not be US citizens. The decision heightened an already brewing conflict and became a key factor in pushing the nation toward civil war.

The Reconstruction Amendments aimed to rebuild the nation and secure freedom after slavery

Ratified between 1865 and 1870 after the conclusion of the war, the 13th, 14th, and 15th Amendments abolished slavery, guaranteed citizenship and equal protection, and extended voting rights to Black men—transforming the Constitution's definition of liberty and equality.

Before 1965, US immigration law relied on nationality-based bans and quotas.

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

This interactive tool from the National Constitution Center allows you to compare constitutional rights globally, highlighting which countries have adopted protections similar to those in the US Constitution—and how shared principles manifest in different legal forms around the world.

An 1873 Supreme Court case about slaughterhouses weakened parts of the 14th Amendment

In 1873, the Supreme Court's Slaughterhouse Cases ruled that the 14th Amendment's "privileges or immunities" clause protected only federal—not state—citizenship rights, greatly limiting the amendment's power to safeguard enslaved people from state discrimination.

The Articles of Confederation were the first governing documents of the United States

Drafted in 1777 and ratified in 1781, the articles created a weak national government without the ability to tax or regulate commerce. This led to problems for the new nation, necessitating the Constitutional Convention in 1787.

A timeline of US immigration laws

The United States began regulating immigration soon after it won independence from Great Britain, and the laws since enacted have reflected the politics and migrant flows of the times. Here's a timeline of key immigration laws from 1790 to 2014, according to the Pew Research Center.

Advocates for restricting birthright citizenship argue that some parents aren't 'fully subject to US jurisdiction'

Proponents of limiting birthright citizenship claim that undocumented immigrants and temporary visa holders do not meet the 14th Amendment's "subject to the jurisdiction" requirement, arguing their allegiance remains with another country.

The US framework of government has influenced the constitutions of many other countries

In 1787, the US Constitution introduced a system built on the separation of powers and individual liberties, including freedom of speech and religion. Though widely influential, its rigidity has made it less of a modern model as countries adopt more adaptable constitutional frameworks.

The US Constitution has been amended 27 different times since its ratification

Dive deeper into each amendment to the Constitution with resources provided by the National Constitution Center. This website features podcasts, videos, and other web resources for each of the amendments, examining their creation and their impact on today’s political and social landscape.

The Bill of Rights was designed to protect individuals from the power of the federal government

When the Bill of Rights was ratified in 1791, its protections applied only to the federal government. It wasn't until the 14th Amendment (1868) and the Supreme Court's doctrine of selective incorporation that most provisions were extended to state governments—a process that began in 1925.

In the US, any court can rule on constitutionality—unlike in most other countries

In the American system, known as diffuse judicial review, federal and state courts at every level may assess whether laws comply with the Constitution, and their decisions are ultimately reviewable by the Supreme Court. Many other democracies, by contrast, reserve constitutional review to specialized constitutional courts.

The Articles of Confederation were not a federal system

Ratified in 1781, the Articles of Confederation left the states sovereign and independent, denied the national government power to tax or regulate commerce, and forced Congress to act through the states—exposing the limits of confederation and paving the way for US federalism.

The first test of America's war powers came just a decade after the Constitution was ratified

During the undeclared Quasi-War with France in 1800, the Supreme Court ruled in Bas v. Tingy that Congress had authorized a valid "imperfect war" through statutes alone, without a formal declaration, establishing that there is a legal spectrum between peace and declared war.

The Civil War permanently strengthened federal power

The Civil War expanded federal power through emancipation, national military mobilization, and postwar civil rights laws, permanently strengthening the national government and shifting the balance of authority away from the states.

The debate over federalism helped produce the novel character of the United States

During ratification, Federalists argued that a strong national government was essential for national survival. Anti-Federalists warned that it could overwhelm states and threaten individual liberty—forcing compromises that shaped early American federalism and led to the adoption of the Bill of Rights.

The Chinese Exclusion Act was America's first major immigration restriction

The act, signed in 1882, barred Chinese laborers from entering the United States, marking the first significant restriction on free immigration. This overview examines 19th-century Chinese immigration, rising anti-Chinese sentiment, and the diplomatic implications of exclusionary legislation.

The 19th Amendment, which granted women the right to vote in the United States, was a culmination of over 70 years of organizing and advocacy.

The 13th Amendment permanently abolished slavery in the United States

Ratified in December 1865, the 13th Amendment outlawed slavery nationwide except as punishment for a crime. Southern states were required to ratify it under President Andrew Johnson's initial Reconstruction plan before regaining representation, though Congress later imposed stricter conditions.

The Ninth Amendment clarifies that people hold additional rights, not granted by the Constitution

The Founders worried that listing specific rights might imply that others didn't exist. The Ninth clarifies that unenumerated rights are retained by the people, making it one of the most philosophical and least litigated amendments.

What impact did WWI have on the US civil rights movement?

One of the great hypocrisies in American history involve the expectation of African-Americans to defend liberty in several wars while being deprived of it when they returned home to, as this article puts it "disfranchisement, segregation, debt peonage and racial violence." The writer reflects on World War I and how it affected the fight for civil rights in the USA.

Colonial self-rule fostered strong autonomy and distrust of centralized power

American colonies were governed through a patchwork of different systems, ranging from Crown-run to locally controlled. Broad local autonomy—often followed by sudden imperial crackdowns—taught colonial leaders to prize home rule and distrust distant centralized power, attitudes that later informed US federalism.

The Bill of Rights spent more than a century largely ignored by the courts

When ratified in 1791, the Bill of Rights applied only to the federal government, which exercised little direct control over daily life. It played a limited role in early constitutional law until the 20th century, when legal advocates began using it to challenge state and local laws.

The Constitution is difficult to amend

Amended just 27 times in more than 230 years, the US Constitution is deliberately hard to change. This animated video from TED-Ed explains why the amendment process is so complex and what that rigidity means in practice.

Despite the Juneteenth announcement that they were free, some enslaved people were still held captive.

The 1787 Constitutional Convention was initially called to amend the Articles of Confederation

Delegates initially met in 1787 to amend the Articles of Confederation, but within weeks chose to redesign the government entirely. Months of intense debate over power and representation produced the compromises that shaped the Constitution.

A poll from May 2025 found that a majority of Americans oppose ending birthright citizenship

As legal challenges progressed, a May 2025 NPR/Ipsos poll showed fewer than one-third of Americans supported eliminating birthright citizenship, despite broader public backing for other immigration restrictions.

Throughout most of the 1800s, US currency was backed by silver and gold

In post-Civil War America, the government moved to use only the gold standard. This was how US currency was backed for decades in the US. You can read a comprehensive explainer on the gold standard and its history in the US to learn more.

Black Americans were systematically excluded from juries for much of US history

Literacy tests, poll taxes, and even explicit laws kept Black Americans off juries until well into the 20th century. The Jury Selection and Service Act of 1968 mandated that federal juries reflect a fair cross-section of the community, though racial disparities in jury selection persist.

The framers of the Constitution designed the amendment process to be difficult

Amending the Constitution requires substantial and widespread public support. Since 1879, more than 10,000 amendments have been proposed—many repeatedly—ranging from banning flag burning to repealing the income tax. This resource highlights some of the most notable failures.

The 15th Amendment granted Black men the right to vote nationwide

Ratified in 1870, the 15th Amendment prohibited federal and state governments from denying the right to vote based on race, color, or previous condition of servitude—enfranchising millions of Black men.

The United States is the world's oldest continuously operating federal system under a written constitution

The US pioneered federalism in the late 18th century, and many countries later adopted federal systems to manage conflict and share power. This resource features interactive maps that trace the spread of federal systems worldwide from 1900 to the present.

The 1783 peace treaty with Britain formally ended the Revolutionary War and nearly doubled the size of the United States.

Courts have blocked the Trump administration's 2025 executive order limiting birthright citizenship

In June 2025, the Supreme Court declined to rule on the constitutionality of the order. Since then, two federal appellate courts have found the order unconstitutional, halting its enforcement nationwide.

The first time the US federally barred immigration based on nationality

Watch this six-minute video to learn about the Chinese Exclusion Act of 1882, which was the first federal law to bar immigration explicitly because of nationality.

The Judiciary Act of 1789 created the foundation of the federal justice system

Passed by the First Congress, the Judiciary Act of 1789 established the federal court system, the Office of the Attorney General, and the US Marshals Service—the first law concerning national law enforcement and legal administration.

James Madison's original draft of the First Amendment was far more expansive than what was ratified

Madison's first proposed language guaranteed the right "to speak, to write, or to publish" one's sentiments freely—broader and more explicit than the final text—and described the free press as "one of the great bulwarks of liberty."

The Civil War turned the Continental Divide into an American symbol of identity

Historians argue that the boundary only became a celebrated American symbol in the 1860s, when Civil War-era leaders promoted a west-east geographic divide to replace the devastating north-south political divide, and that the term's use spiked after the transcontinental railroad crossed it in 1868.

Explore the world's oldest constitutions

The 1789 US Constitution remains the oldest active written national constitution. Older systems exist—such as San Marino’s statutes or the Magna Carta—but they are not single, codified constitutions. See how other countries compare in this visualization.

President Donald Trump signed an executive order in 2025 to restrict birthright citizenship

In 2025, President Trump signed an order attempting to end automatic citizenship for children born to undocumented immigrants or temporary visa holders—limiting it to those with a US citizen or permanent resident parent.