Answer:
The three departments of the executive branch that were set up by Congress in 1789 were:
Department of State: responsible for the nation's foreign affairs, including negotiating treaties, managing diplomatic relations with other countries, and maintaining records of all official communications and treaties.
Department of the Treasury: responsible for managing the government's finances, including collecting taxes, managing the national debt, and printing and regulating the nation's currency.
Department of War: responsible for managing the nation's defense, including overseeing the Army, providing for the nation's defense, and managing relations with Native American tribes.
These departments were established by the first Congress under the new United States Constitution and were designed to help the president manage the nation's affairs more effectively. Each department was headed by a Secretary who was appointed by the President with the advice and consent of the Senate.