Which part of government represents the nation and sets policy? the house the president the senate the supreme court

The part of the government that represents the nation and sets policy is the President.

Explanation:

President of the United States is the title that receives the head of state and head of government of the United States, the highest political office of the country by influence and recognition. The president leads the executive branch of the federal government and is one of two elected members of the executive branch (the other is the vice president). Among other powers and responsibilities, Article II of the Constitution of the United States entrusts the president to the "faithful execution" of the federal law, makes the president commander in chief of the armed forces, authorizes him to appoint executive and judicial officers with the advice and consent of the Senate, and allows the president to grant pardons.

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.