Answer: The American Revolution was a costly war and left the colonies in an economic depression. The debt and remaining tensions—perhaps best summarized by a conflict in Massachusetts known as Shays' Rebellion—led some founding political members in the U.S. to desire for more concentrated federal power.
The Tenth Amendment or also referred to as Amendment X in simple terms is "Any power that is not given to the federal government is given to the people or the states." Hope this helps.
