The U.S. government has three branches — legislative, executive, and judicial. Most people can name them. Far fewer people can explain what each one actually does on a typical Tuesday, and why the founders were so insistent that the same people not control more than one of them.
The Legislative Branch — Congress
Congress is the branch that makes federal law. It consists of two chambers that must both agree before any legislation can be sent to the president. The Senate has 100 members — two from each state, regardless of population, serving six-year terms. The House of Representatives has 435 members — apportioned by state population, serving two-year terms. California has 52 representatives. Wyoming has one.
Congress does not just vote on bills. It holds hearings to investigate the executive branch, government agencies, corporations, and any matter of public concern. It confirms or rejects the president's nominees for cabinet positions, ambassadors, and federal judges including Supreme Court justices. It controls the federal budget — no money can be spent by the government without Congress appropriating it. It has the sole power to declare war, though presidents have frequently committed military forces without that declaration.
The Senate has specific powers the House does not. It ratifies treaties with foreign countries by a two-thirds vote. It holds impeachment trials when the House votes to impeach a president, vice president, or federal official. The House has specific powers the Senate does not — all revenue bills, meaning bills that raise taxes, must originate in the House.
The Executive Branch — The President and the Cabinet
The president heads the executive branch, which is responsible for carrying out and enforcing the laws Congress passes. The executive branch is enormous — it includes 15 cabinet departments, dozens of independent agencies, the military, and approximately 2.9 million civilian federal employees.
The president's specific constitutional powers include commanding the military as commander in chief, conducting foreign policy, negotiating treaties, appointing federal judges and cabinet officials subject to Senate confirmation, granting pardons for federal crimes, and vetoing legislation passed by Congress. The president also has the power to issue executive orders — directives to the executive branch that carry the force of law but do not require congressional approval.
The vice president serves as president of the Senate and casts the deciding vote in the event of a tie. The cabinet — the heads of the 15 executive departments — advises the president and runs their respective agencies. Cabinet secretaries are nominated by the president and confirmed by the Senate.
The Judicial Branch — The Courts
The judicial branch interprets the law. When a dispute arises about what a law means, whether a law violates the Constitution, or whether the government has acted within its legal authority, federal courts decide. Their decisions are binding — the executive branch must follow them and Congress must work within them.
The federal court system has three levels. District courts are the trial courts where cases are first heard. Circuit courts of appeals review district court decisions. The Supreme Court sits at the top and has the final word on questions of federal and constitutional law. Its decisions bind every court in the country.
Why Separation of Powers Matters Today
The separation of powers is not a historical curiosity. It is an active daily reality. When a president issues an executive order, courts can strike it down. When Congress passes a law, the president can veto it. When the Supreme Court issues a ruling, Congress can sometimes respond with new legislation. These tensions are not failures of the system — they are the system working as designed.
The founders were explicit: they were not designing a government that would be efficient. They were designing one that would be difficult to corrupt. Concentration of power was the enemy. Friction between the branches was the safeguard.
The full list of current members of Congress is at congress.gov. The current cabinet and executive agencies are listed at usa.gov. The federal court system is explained at uscourts.gov.