A major impact of the Cuban Missile Crisis was that it brought the world dangerously close to nuclear war. This crisis showed that there was great potential for a nuclear armed conflict to potentially break out.
Answer: The Department of State
Enconmienda differed from slavery in that the Spanish designed the system partly as an economic one, but also as a means of civilizing/Christianizing the indigenous peoples of Latin America and the American Southwest. Slavery, on the other hand, was purely an economic system and instead of encompassing indigenous peoples, it involved the forced relocation of inhabitants of Africa to North and South America.
Ask yourself, instead, the opposite:
With the creation of the atomic bomb (there being 2 already, and 1 on the way), would it be necessary to risk millions of troops, billions of dollars worth of equipments, and trillion dollars in costs, to attack each island one by one, in hope of defeating Japan? The U.S. at Okinawa already knew how the Japanese would fight, with tooth & nails, and how surrender is not an option. With the ultimation of 2 atomic bombs dropped on Hiroshima & Nagasaki respectifully, and the 3rd one being prepped, it not only gave the devastating feel, but also time for the Japanese government to ponder whether or not they should continue a war that they will lose anyways. In war, to save a life, 100% of the time a death must occur. It was necessary to bring destruction to Japan to save the lives of millions of Allied troops, and that in doing so, the A-bombs were used.