The global economy runs on US dollars, with nearly 90% of international trade in 2019 being processed in US dollars.

The US dollar became the world's reserve currency, backed by gold, after 44 nations gathered in Bretton Woods, New Hampshire, in 1944 with the intention of rebuilding the global economy.

The US dollar is the official currency of the United States and is the most circulated currency around the world

The US dollar was established in 1792 and comes in the form of coins or paper money. It's considered one of (if not the most) stable currencies in the world due to America’s strong and robust economy, as well as its relatively stable government.

The US dollar has served as the world's reserve currency for 80 years—but is its dominance coming to an end?

Since the establishment of the Bretton Woods economic system, about 90% of global foreign exchange transactions have involved USD. Although no viable alternative exists yet, the dollar's share of central bank reserves has decreased from 73% to 58% from 2001 to 2024, and President Trump's 2025 tariffs have sped up this trend.

A dollar bill's value relies on two elements: people believing it will be accepted in exchange for goods and services, and how much demand for the currency there is.

British economist John Maynard Keynes originally proposed a global currency called the bancor.

The US has used a wide variety of different currencies between the 1690s and today

From colonial money to national banknotes, people have used all kinds of forms of currency throughout the history of the United States before settling on the dollar bills and quarters that we pay for things with today.

See the value of currency in circulation in billions of dollars as of Dec. 31 of each year.

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.

Nixon's 1971 decision to untether the dollar from gold ended the Bretton Woods exchange rate system

The Bretton Woods system initially pegged all major currencies to the US dollar, which could be exchanged for gold at a fixed rate of $35 per ounce. Growing deficits and decreasing gold reserves prompted Nixon to end that guarantee in 1971, marking the end of the fixed exchange rate era.

The Federal Reserve is the most powerful financial institution in the US

The Fed controls the money supply, determines interest rates, and regulates the banking system. Established in 1913 after a volatile series of financial panics, the central bank has managed to retain its legitimacy despite broad critiques against its obscure and independent decision process.

Some scholars consider the Bretton Woods system one of the best foreign policy decisions in US history

A survey of historians by the Council on Foreign Relations ranked the creation of the Bretton Woods system among the top 10 foreign policy decisions in US history, highlighting its role in establishing postwar stability, prosperity, and decades of economic growth.

Harry Dexter White outmaneuvered Keynes to make the dollar the center of the new global monetary system

The chief US Treasury economist at the conference, White, advocated for a dollar-centered exchange rate system over Keynes' competing idea of a new global currency, shaping the postwar economic order for decades.

No institution wields more power in US finance than the Federal Reserve, the central bank of the US—but opinion polls indicate that most Americans don't know what it does.

Ranking the world’s economies: 1980 vs. 2025

The US remains the world’s largest economy, having increased its annual gross domestic product from $2.9T in 1980 to $30.6T in 2025. In 1980, China ranked seventh globally with a GDP of $304B. In 2025, China ranked second with a GDP of $19.4T.

Stablecoins could give people in high-inflation economies access to stronger currencies

Specifically, stablecoins could provide a way to make sure these funds remain valuable during times of volatility. Some examples of people without access to the US dollar using stablecoins as a store of value have been observed in Venezuela.

The world's largest stablecoins by market cap

The largest stablecoin by market cap, Tether (USDT), as well as the second largest, USDC, are both pegged to the US dollar. As of April 2026, Tether had a roughly $184B market cap.

Some argue that stablecoins are unnecessary due to the ubiquity of the US dollar

Others have criticized fiat-backed stablecoins for their lack of decentralization, believing that digital currencies not controlled by central banks will become more popular in the future.

The US dollar is the most popular note to counterfeit

Counterfeit operations are often controlled by rogue governments, drug cartels, and more. These organized crime rings often sell counterfeit bills wholesale, for anywhere between 40 and 70 cents per dollar.

Watch what would happen if you literally had all the money in the world.

Stablecoins like USDC are backed by real assets including US Treasurys and cash

While Tether (USDT) is primarily backed by US Treasury bills (64.9%), USDC is mostly backed by US Treasury repurchase agreements (49.6%). USDC also goes by the name Circle, given that it is owned by the company Circle Internet Financial.

See a breakdown of how each country contributes to the world's $126T economy.

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 first stablecoin pegged to the US dollar launched in 2014

That coin was Tether, also known as USDT. Other key dates in stablecoin history include Circle's launch of USDC in 2018, and, more recently, President Donald Trump's signing of the GENIUS Act in 2025.

The Federal Reserve follows the health of the US economy by tracking the money supply

That includes all of the physical and electronic money in circulation. It tracks not only US coins and bills, but also the money that moves through bank deposits. The Fed uses metrics called trackers to follow different types of transactions through the money supply.

Understanding why the US can't use its own crude oil and depends on global markets

Before advancements in fracking technology made lighter shale oil readily available, US refineries had been built and optimized for decades to process heavier oil from other countries with high profitability. Despite being able to refine lighter oil, US oil companies can operate with better margins by exporting it to other nations whose refineries are optimized for it and importing heavier oil, for which the US has the infrastructure.

About 80% of US debt is held by domestic and foreign investors.

The Bretton Woods conference in 1944 created the foundations of the modern global economy

In July 1944, 44 nations gathered in Bretton Woods, New Hampshire, to create a new postwar economic order. The conference led to the creation of the IMF and the International Bank for Reconstruction and Development—now known as the World Bank.

Switzerland's currency is so strong that it could cause deflation

Economic instability in the United States in 2025 strongly benefited Switzerland, where the value of the franc relative to the dollar increased by about 12.7%. In response, the price of imports dramatically decreased, making goods overall much cheaper.

The US has carried debt since 1791

After the Revolutionary War, the US owed $75M to nations like France. Debt builds when spending exceeds revenue, funding programs, wars, and economic recovery efforts. Most debt is domestic, like Social Security bonds, with foreign nations also holding a share.

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

Some argue that the rising US national debt has become more important in recent months.

US inflation can generally be split into to two periods—before and after the Federal Reserve

A central bank itself does not mean significant inflation will occur, but economists generally point to factors like two world wars and the printing of money to finance the US federal deficit as primary drivers of price increases.

A gold standard is a system in which a country’s currency is pegged to, and can be converted into, a fixed amount of gold

In principle, this provides price stability as the amount of gold (and therefore the value of the currency) is limited, but also restricts the ability to modulate the money supply during economic downturns.

Visualizing the world's wealth in 2019

The world has a net worth of $360T. The U.S. economy continues to dominate given its sheer size, Asia and Europe are not that far behind.

Nearly 70% of the US government’s debt is domestic

This includes intragovernmental holdings like the Social Security Trust Fund and investments from US citizens, banks, and mutual funds. About 30% is foreign-held, with countries like Japan and China as major creditors, investing in US Treasury securities due to their perceived safety.

Arguments for returning to a gold standard reappear from time to time

However, critics argue that globalization has made the gold standard impractical for modern economies, as it limits a nation’s ability to have a flexible monetary policy—hence, none of today's governments have a gold standard.

Visual Capitalist shows the top 50 countries by central bank reserves

As of 2024, China, Japan, and the United States held the top three spots in terms of the value of their respective central bank reserves.

USDC's reserves were held at Silicon Valley Bank when the bank collapsed

One of the world's largest stablecoin's reserves were held at Silicon Valley Bank, which famously failed in March 2023. USDC briefly lost its peg to the US dollar for a time as a result, within investors pulling out billions of dollars.

Hear Steve Ballmer explain how US gas prices are affected by the global price of oil.

The portrait of George Washington was first placed on the one-dollar bill in 1869

Trace the history of the US dollar from its colonial roots to its adoption as the national currency. The video explores the word's Germanic origins, how the dollar sign evolved from the Spanish peso, and how Washington's portrait came to define US paper currency.

Some economists argue that the national debt is not a critical concern.

Fort Knox was originally built to be a secure facility for the US Treasury's gold reserves back when the US still operated under the gold standard, a system in which a country's currency is pegged to, and can be converted into, a fixed amount of gold.

Stablecoins' market cap surged during 2021's crypto bull market

In 2020, the value of all stablecoins was equivalent to just 1% of all physical US dollars. Roughly five years later in August 2025, that value had jumped to roughly 11% of all US cash in circulation.

Collaterized by crypto, BitUSD is considered the first stablecoin

It was created in 2014 with the intention of making cryptocurrency less volatile. While BitUSD lost its peg to the US dollar in 2018 and never recovered, Tether was created soon after it in 2014 and has had more longevity and success.

A gold standard is a system where every dollar in circulation can be exchanged for a set amount of gold

For centuries, the things people used as money had intrinsic value, such as precious metals like gold. In medieval Italy, giant wheels of parmesan cheese were once used as a store of value.

Dive into the fascinating journey of a Federal Reserve note

Ever wondered how long an individual dollar bill lasts? After cash is designed and produced, money circulates in the economy, with $100 bills staying in use for the longest on average—roughly 15 years—and the $10 lasting just less than five.

As of 2022, the US accounted for nearly one-fifth of global oil production

By 2022, the US had cemented its position as the world’s top oil producer with close to 18 million barrels per day. This eclipsed Saudi Arabia and Russia.

The US shipped nearly 4 billion barrels of oil abroad in 2024

More than half of the US’s oil is exported as the country produces mainly light, sweet crude but has many refineries that handle heavy, sour types.

Commodity traders are the most powerful people you've never heard of

Just beneath the surface of the global economy is a hidden layer of dealmakers for whom war, chaos, and sanctions can be a great business opportunity—they're called commodity traders. Their power partly stems from the fact that commodities are essentially the building blocks of the economy at large.

Tariffs once fueled the US economy, historically serving as a primary source of revenue and a means to protect domestic industries.