Actually, if I can dwell on that last point of yours. There is much debate on the necessity of dropping the Nagasaki and Hiroshima bomb. At that point in the war Japan was losing on all fronts: Germany had surrendered and USSR had just declared war on Japan. USA had invaded Okinawa and were at the doorsteps of Japan. Japan was close to surrendering. So why drop the bombs? Several reasons: yes to end the war a little sooner, avoiding the need to invade Japan, possibly losing many valuable soldier's lives. A couple of hundred thousand civilians will make Japan think twice. Most importantly it was to test the nuclear bombs, after all they have never been used before in combat. That is why they used two different bombs. Thridly, and the main reason: To scare the living daylights out of the Russians. A new, super weapon the world had never seen before. Prove American superiority and prevent any monkey-business from Stalin.
All this for the cost of a couple of hundred thousand Japanese civilians! Not a bad deal, eh?