What did many people want added to the constitution before they would
approve it?

The Bill of Rights.

Explanation:

Those such as the Anti-Federalists supported a weaker government and stronger states. They were afraid of the government becoming too powerful with the Constitution, and thus wanted the Bill of Rights to be added to ensure that the central government did not become dictatorial and over-powered.

they united the colonies in their fight against the british.

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.