US institutions and society
Last reviewed: October 31, 2026
This section explains how the United States is governed, who decides what, and how Americans argue about the big issues. The country's institutions look familiar from the outside: three branches, a constitution, regular elections. The details are less familiar. The Electoral College, primaries, strong states, and a Supreme Court with life tenure can all trip up readers used to a parliamentary or more centralized system.
Where to start
- Begin with how the US government works for the basic map: three branches and how they limit each other.
- Read states vs. the federal government to see which powers sit at which level, the question behind many US political fights.
- Then turn to how US elections work and Democrats vs. Republicans to see how power is won.
Institutions
How the US government works
The President, Congress, and the Supreme Court, how a bill becomes law, and checks and balances.
ReadHow US elections work
The Electoral College, primaries, midterms, who can vote, and campaign money.
ReadDemocrats vs. Republicans
The two parties compared on the main issues, plus their history, voters, and third parties.
ReadStates vs. the federal government
Who handles taxes, schools, crime, and marriage, and what happens when their laws collide.
ReadThe US Constitution
The seven articles, the Bill of Rights, key amendments, and today's constitutional debates.
ReadThe federal system
Federal powers, how the government is organized, and where its money comes from and goes.
ReadThe judicial system
The Supreme Court and its justices, federal and state courts, juries, and plea bargains.
ReadSociety and policy
US gun laws and the Second Amendment
Supreme Court rulings, federal and state rules, the numbers, and both sides of the debate.
ReadImmigration in the US
How legal immigration works, people without status, DACA, birthright citizenship, and changes since 2025.
ReadThe US economy
Key figures, main sectors, the dollar, the Federal Reserve, Wall Street, and tariffs.
ReadPolice and criminal justice
Thousands of police agencies, the path from arrest to verdict, prisons, and the reform debate.
ReadThree things to keep in mind
- The US is a federation. The 50 states write most of the laws that touch daily life, so "US law" on a subject often means 50 different laws.
- Courts are central. The Supreme Court can strike down laws and presidential actions, and many political disputes end there. In 2026 alone it ruled on tariffs, birthright citizenship, voting rights, and gun rights.
- Elections are state by state. Even the presidency is decided through 51 separate contests, which is why a few swing states get so much attention.
Who holds power
Donald Trump, a Republican, has been president since January 2025, and Republicans control both chambers of the 119th Congress (2025–2027). The Supreme Court has six justices appointed by Republican presidents and three by Democratic presidents. The next Congress, chosen at the November 3, 2026 midterms, takes office in January 2027.
For broader context, see What is the United States? and American values. For how this affects everyday life, see the Living in the US guides.