Much of the time, the United States government runs pretty smoothly. Laws are passed and enforced. Court cases are heard. Relations with other countries are carried out.
This is due largely to the genius of our Constitution. The Constitution sets up three branches of government. They are the legislative branch, the executive branch, and the judicial branch. The legislative branch makes the laws. The executive branch enforces the laws. And the judicial branch decides whether laws are constitutional or not. The Constitution also sets up the separation of powers. That means the government has a system of checks and balances. The checks and balances make sure no one branch of government has too much power.