Answer:
It could be said that republicanism, democracy, and federalism are the most important political ideologies in the U.S. Constitution.
Explanation:
Republicanism - The Constitution establishes a republican government that is composed by elected officials instead of a unelected monarchy or dinasty. The government is divided in three branches: the executive (president), the legislative (congress), and the judiciary (the courts), which configurates a form of republican government.
Democracy - The United States is a democracy because the government serves the people, and the people have the right to overthrow or change the government. This right is established in the U.S. Constitution.
Federalism - The Constitution establishes a federal republic, composed of several states under a perpetual union. The federal government only has the powers explicitely given to it by the U.S. Constitution, anything else is left to the states.
