It marked the first peaceful transfer of power between political parties in American history. (the first option.)
These people were also referred to as hippies as well as counter culture. This was because while America was going places and improving, the "counterculture" wanted to stay right where they were. They didn't like the way America was going so they chose to live how America was.
Because an infantry invasion of Japan, would have resulted in <em>Far</em> more casualties for both the americans and the japanese. Than the dropping of an atomic bomb.
C. Benjamin Franklin's practical inventions designed to make life safer and easier please mark me as the brainlyest answer if I'm correct