In the United States, all political power resides in the people, a concept known as popular sovereignty. The people are the only source for any and all governmental power. Government can govern only with the consent of the governed
That government exercises those powers through popularly elected lead ers who are chosen by the people to represent them in the exercise of the peoples power.
The principle of limited government states that no government is all-powerful. That government may do only those things that the people have given it the power to do.
constitutionalism: government must be conducted according to constitutional principles.
rule of law, holds the government and its officers, in all that they do, are always subject to—never above—the law.
the legislative, executive, and Judicial powers of government are all gathered in the hands of a single agency. British government is a leading example of the form. In a presidential system, these basic powers are distributed—separated—among three distinct and independent branches of the government.
These three branches are not entirely separated nor completely independent of one another. Rather, they are tied together by a complex system of checks and balances. This means that each branch is subject to a number ofconstitutional checks, or restraints, by the other branches. In other words, each branch has certain powers with which it can check the operations of the other two.
Congress has the power to make laws, but the President may veto (reject) any act of Congress.
Tlie principle of federalism—the division of power among a central government and several regional governments—came to the Constitution out of both experience and necessity.