Why was the tenth amendment enacted?

The final of the 10 amendments that constitute the Bill of Rights, the Tenth Amendment was inserted into the Constitution largely to relieve tension and to assuage the fears of states’ rights advocates, who believed that the newly adopted Constitution would enable the federal government to run roughshod over the states and their citizens. While the Federalists, who advocated a strong central government, had in that respect prevailed with the ratification of the Constitution, it was essential to the integrity of the document and to the stability of the fledgling country to acknowledge the interests of the Anti-Federalists, such as Patrick Henry, who had unsuccessfully opposed the strong central government created by the Constitution.

the two atomic bombs dropped on japan in 1945 killed and maimed hundreds of thousands of people, and their effects are still being felt today. the uranium bomb detonated over hiroshima on 6 august 1945 had an explosive yield equal to 15,000 tonnes of tnt.