Answer:
Bill of rights exchange for support
Explanation:
I would say that the stirrup allowed for quicker mounting of the horse, and it may have caused horses to be used in battle more frequently.
This is called a federal republic. The states have their own laws that apply to them. They also have a set of federal laws that apply to all members of a federation. The United States are a federal republic because the government is a federal and nation wide, but the states have their own powers too.