The United States is a combination of federalism and * * * and the separation of powers between the two houses was established by the 1787 Constitution. Before the Constitution of 1787, 13 states in the United States acted in their own way, each with its own state constitution, and competed viciously with each other, almost without the restriction of the federal government, so the Federation was too loose, so the constitution was re-established.

Of course, the separation of powers is to prevent excessive centralization from forming autocracy, which is a game between the state government and the federal government.

The purpose of dividing the House of Representatives and the Senate is to balance the number of members from continents and small continents and the election rate of members, which is the result of the game between States.