Read the following excerpt and answer the question below. Will give Brainiest "We the People of the United States, in Order to form a more perfect Union, establish Justice, insure . . . peace, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and [future generations], do [call for] and establish this Constitution for the United States of America."

Based on the excerpt, what was the main reason that the Founding Fathers wrote the Constitution?

A. They wanted to reduce the power of the states.
B. They wanted to improve the alliance of the states.
C. They wanted to establish new courts for the states.
D. They wanted to resolve important differences among the states.