Which amendment was designed to allay anti–federalist fears of a central government with too much power

The 10th Amendment, that the powers not written in the Constitution, nor prohibited by the State are given to the people. Hope this helps. 

How  did spanish  power increaseunder charles  v and philip ii? in 1519,charles  v inherited a huge empire. he became king of  spain  and was also the heir to the hapsburg empire. during his 42-year reign, philip worked to expand  spanish  influence, strengthen the catholic church, and make his own power absolute. hope this !