One of the principles of the Constitution is Checks and Balances. Checks and Balances is important because it makes the government in such a way that none of the three branches can gain a lot of power. That had been and still is a problem in forming democracies because usually one branch of government doesn't have enough power over the other two. Hope this helps! Please let me know if I'm wrong :)
One of the principles is that only the congress can pass laws regarding taxes and can collect taxes for the country. This principle is important because it prevented anyone else who might became a wealthy corrupt politician from collecting taxes from people in the state where he was the most powerful person. It also prevents individual states from exploiting people.
