US Customs and Border Protection traditionally operates at ports of entry and along US borders

Canine inspectors can help detect potential carriers of invasive insects

At ports of entry in the US, Customs and Border Protection agents use dogs to sniff for forbidden foods and other items that are known to harbor invasive pests. Agents also physically inspect items such as flowers to prevent entry by species that may harm US agriculture.

The Department of Homeland Security manages America's border and immigration enforcement

DHS serves as the umbrella agency managing immigration enforcement, border security, and related public safety responsibilities. Learn more about the department's budget, strategic initiatives, organizational history, and coordination of multiple agencies.

Immigration and Customs Enforcement handles immigration enforcement within the interior of the US

ICE operates inside the United States, enforcing immigration laws through investigations, arrests, detention, and deportation of individuals residing in the country illegally. This page provides an overview of the agency's mission, structure, and internal enforcement operations.

In June 2025, apprehensions of illegal border crossings at the US-Mexico border reached an all-time low

Total US-Mexico border encounters fell to just 25,228—the lowest monthly figure ever recorded by Customs and Border Patrol—with only 8,024 Border Patrol apprehensions and a single-day low of 136 detentions on June 28.

How the US first installed an electronic fence along the southern border

The US Border Patrol's first automated surveillance system launched in 1970 with 177 ground sensors installed along a single section in California. The sensors had already been used in Vietnam, along the so-called McNamara Line, and were connected by radio transmitters to magnetic-tape computers. They were implemented to target people defined by law and deportable aliens.

The Immigration and Customs Enforcement agency was created in the aftermath of the 9/11 terrorist attacks.

Policies related to the coronavirus pandemic inadvertently increased illegal border crossings

A pandemic-era public health measure called Title 42—intended to seal the border by expelling migrants immediately—backfired. Because expulsions carried no legal consequences, migrants simply tried again, driving illegal crossings to a peak of over 370,000 people in December 2023.

Visa overstays account for nearly 40% of illegal US entries

In fiscal year 2023, approximately 510,000 people overstayed their visas, while 860,000 crossed the border illegally, meaning overstays accounted for 37% of the total number of new unauthorized arrivals. This represents a shift from 2007 to 2018, when overstays outnumbered border crossings, to 2019, when illegal crossings surged again.

The 2025 budget bill significantly increased ICE's budget and role in federal law enforcement

The 2025 'Big Beautiful Bill' allocated $170B to immigration and border enforcement for use through 2029. ICE's nearly $100B share includes substantial increases in detention capacity and operational scope. The increased funding will make ICE the most heavily funded federal law enforcement agency.

Multiple legal pathways exist for immigrating to the United States

This comprehensive guide outlines various routes to US immigration, including family-sponsored and employment-based visas, as well as humanitarian protections. Navigate the complex American immigration system and understand the options available to prospective immigrants seeking legal entry.

The Bureau of Prisons manages 122 federal prisons and over 150,000 inmates

The Federal Bureau of Prisons, part of the DOJ, runs 122 facilities across the United States, holding over 150,000 inmates. It manages custody, security, rehabilitation, and reentry programs within the federal correctional system.

See how the executive branch of the US government works

The executive branch enforces federal laws and is led by the president, who serves as head of state, commander in chief, and chief diplomat. Supported by the vice president, Cabinet, and around 4 million federal employees, it carries out laws through 15 departments and dozens of agencies.

Container ships are just a fraction of total traffic via the canal

While more container ships traverse the canal than any other type of ship, vessels carrying dry bulk goods, vehicle carriers, chemical tankers, passenger ships, and more also pass through the Central American passageway.

Explore over a century of US-Canadian relations.

The Office of Chemical Safety and Pollution Prevention regulates toxic substances

This office evaluates and manages risks from industrial chemicals and pesticides. It reviews new chemicals before they enter the market, restricts hazardous substances, and promotes safer alternatives to protect human health and the environment.

Immigration enforcement shows how federalism plays out on the ground

In recent years, federalism has shifted from allowing policy diversity across states to open conflict, with states and the federal government increasingly trying to impose their preferences on one another over issues like abortion, voting, immigration, and public health.

Sanctuary cities limit local cooperation with federal immigration enforcement

Sanctuary cities limit how local agencies help ICE—such as restricting detainers, jail transfers, or data sharing—while still enforcing criminal law, leaving immigration enforcement mostly to federal authorities.

The EPA partners with other countries to strengthen environmental protection

Through bilateral programs on every continent, the EPA shares American environmental expertise with developing nations and economies in transition. These partnerships support air and water protection, chemical safety, and pollution control, while advancing US environmental priorities abroad.

The DEA enforces federal drug laws under the Department of Justice

Established in 1973, the Drug Enforcement Administration directs federal efforts to fight illegal drug trafficking, oversee controlled substances, and dismantle large narcotics networks both within the United States and internationally.

Hardline China critics in the US worry that China's Belt and Road Initiative is a Trojan horse for military expansion efforts

The Belt and Road Initiative, initially launched in 2013 to develop trade routes throughout Europe, Asia, and the Middle East, has evolved into a larger infrastructure development initiative in developing countries. The BRI is backed by the Silk Road Fund, which is administered by the two most prominent Chinese sovereign wealth funds.

Employers must apply for H-1B visas on behalf of foreign workers

To hire an H-1B worker, US employers first file with the Department of Labor, then petition the US Citizenship and Immigration Services. They must attest that they won't replace American workers, and that they will implement stricter rules for firms that rely heavily on H-1B visas.

What is crossing a picket line?

A picket line refers to a boundary that workers on strike ask others not to cross. That boundary could be a physical place, like the entrance to a place of work, or something else, such as digital journalists asking people not to visit their news organization’s website while they strike. This video explains what happens when someone crosses a picket line, including some recent examples. Watch it here.

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

US marshals conducted the national census for nearly a century

From 1790 to 1870, US marshals handled the national census, gathering population data from every district. The responsibility was gradually transferred to a separate federal office that would officially become the Census Bureau in 1902.

The US Board on Geographic Names is responsible for ensuring uniform usage of geographic names within the government.

Airport security scanners use X-rays to infer baggage contents, with newer machines combining images taken at multiple angles and with various X-ray energies for improved threat detection.

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.

Read a breakdown of the different financial and banking regulatory bodies in the US, including the SEC.

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.

How America's cocaine habit fueled its migrant crisis

The United States has been facing a migration crisis along its southern border. Thousands of people have been fleeing their homes in Central America, traveling north through Mexico, and claiming asylum in the USA. Much of this crisis can be traced...

Trump's 2025 asylum suspension departed from a policy framework in place since 1980

In January 2025, President Trump issued an executive order suspending the asylum program and halting application processing at the southern border. This represents a departure from recent American asylum policy traditions and international humanitarian commitments.

H-1B visas let US employers hire skilled foreign professionals in specialty occupations

The H-1B is the main US program for temporary high-skilled workers, covering roles in technology, engineering, medicine, and finance. Issued for up to six years, it often serves as a pathway to permanent residency.

The US handed control of the canal back to Panama in 1999

This was the result of two treaties signed during President Jimmy Carter's presidency, one shifting control to Panama and the other declaring the canal zone neutral. In recent years, US officials have suggested the US may retake control. Experts agree that the only viable way would be through military force.

Issues of ICE conduct span multiple Republican and Democratic administrations

Complaints of abuse and harsh treatment increased as detentions and deportations of undocumented immigrants reached record levels during former President Barack Obama's first term. Frontline investigated the causes of these claims in 2011 and found that these issues cross party lines.

US marshals were the first federal law enforcement officers

Established in 1789, US marshals carried out court orders, served subpoenas, made arrests, and collected fines—serving as the federal government's main law enforcement agency across the states for nearly a century before the creation of the DOJ.

Learn about the bodies that govern the US commercial airline industry, such as the FAA

The Federal Aviation Administration (FAA) regulates US air travel, monitoring both safety and advancement. But despite deregulation in the 1970s, the industry has other governing bodies, too, including the US Department of Transportation and the TSA.

How US currency is issued

Cash in the US is the result of a collaborative process between the Federal Reserve, the Treasury Department, regional banks, and a little-known agency called the Bureau of Engraving and Printing. From design to issuance, learn the steps in currency production in the US with this smart, aesthetic interactive.

The FBI is the largest agency within the Department of Justice

The Federal Bureau of Investigation is the DOJ's largest component, leading national efforts to fight terrorism, cybercrime, organized crime, and corruption. It has roughly 38,000 employees and functions as both a domestic intelligence agency and the federal government's main investigative body.

Watch the craziest ways cartels traffic drugs

The war on drugs has forced cartels to be increasingly creative when it comes to smuggling drugs. As police develop methods to catch smugglers, drug traffickers come up with new ways to get their products from producer to seller to buyer. This cycle...

Despite the Supreme Court ruling that President Donald Trump's 2025 tariffs were unconstitutional, billions of dollars in refunds remain unresolved

Over 2,000 lawsuits seeking refunds have been filed by major companies, including FedEx and Costco, but CBP says its systems can't handle the volume. Interest on unpaid refunds is accruing at an estimated $650M per month.

See the real-time numbers of ships traversing the canal each day

This platform uses satellite data to track chokepoints and trade disruptions along the shipping lanes that crisscross the globe. Search for data from more than 1,600 ports, or run the climate scenario simulator.

The entire National Park System is located on public lands, but not all public lands are national parks.

The USPS spent $3.97B in 2024, accounting for .058% of the federal budget.

Over-the-counter markets are used to bypass traditional exchanges while trading

Commodities are regularly traded via OTC markets so that buyers and sellers can bypass central exchanges and negotiate terms more directly. Before the advent of formal exchanges, most assets were traded OTC.

Trade between the US and China has significantly increased in recent decades.

The National Mediation Board handles labor relations for the airline and railroad industries

Established in 1934, this independent federal agency mediates disputes between airline and railroad carriers and their unions, conducts union representation elections, and helps with disagreements over existing contracts with the goal of keeping work in these industries moving ahead.

Commodity trading is regulated by the CFTC to mitigate fraud and risk

Established in 1974, the CFTC regulates these markets (including swaps, futures, and certain types of options) to protect market participants from fraud, ensure fair trading conditions, and generally reduce financial risk.

Track the changes in US immigration law throughout history

This interactive timeline tracks the development of US immigration law, overlaid with time-series data on percentages of the foreign-born population. Explore how each major policy development correlated with immigration levels, revealing the relationship between legislation and demographic change.

Tariffs are taxes levied on goods imported from abroad.

Tariffs are typically paid by the importing company or organization to the US Treasury.