The three branches of government are:
1. Legislative Branch- it's made of two houses of Congress (The Senate and the House of Representatives. Its responsibility is to make the laws.
2. Executive Branch- the President of the U.S. is the head of the executive branch. Its responsibility is to enforce the laws.
3. Judicial Branch- it's made of the court system (The Supreme Court). Its responsibility is to interpret the Constitution and limit the powers of the other branches of government.
Hope I helped!