The bombing of Hiroshima and Nagasaki is one of the most controversial aspects in the history of the United States because many people believe that it wasn't a necessary action to take, in order to win the war. While others think that using the atomic bombs on Japan was essential because it saved many American lives. Others believe that it saved American lives because we didn't have to invade Japan. Albert Einstein sent a letter to President Roosevelt on August 2, 1939, this is what he said: This new phenomenon would also lead to the construction of bombs and it is conceivable – though much less certain – that extremely powerful bombs of a new type may thus be constructed. A single bomb of this type, carried by boat and exploded in a port, might very well destroy the whole port together with some of the surrounding territory. However, such bombs might very well prove to be too heavy for transportation by air. (Sheehan, 39).
The making of this letter sent by one of the world's greatest scientists was the influential start of the Manhattan Project. The Manhattan Project was a research program funded by the United States, with participation from the United Kingdom, and Canada. Around 130,000 people worked on the Manhattan Project, and it cost around 2 billion dollars to complete. It took a couple of years for the completion of a usable nuclear bomb. It was up to Eisenhower whether or not to use it, which was easy to decide now, because Japan bombed Pearl Harbor. Some new inventions that the United States made specifically for World War II were: B-29 bombers, M-69 bombs, and the forever- changing atomic bomb. The B-29 was the newest airplane; it was faster stronger and over-all better than any bomber before it. It can fly around 1500 miles to a target, and back. The B-29's wingspan is 141 feet, has four powerful engines, and can fly at altitudes up to 38,000 feet. The B-29 was the first plane to use