Answer: The legislative branch makes all laws, declares war, regulates interstate and foreign commerce and controls taxing and spending policies.
Explanation: "The legislative branch is made up of the House and Senate, known collectively as the Congress. Among other powers, the legislative branch makes all laws, declares war, regulates interstate and foreign commerce and controls taxing and spending policies."
Most important power the legislative branch has: "Congress, as one of the three coequal branches of government, is ascribed significant powers by the Constitution. All legislative power in the government is vested in Congress, meaning that it is the only part of the government that can make new laws or change existing laws."