During World War II, on August 6th, 1945, an American B-95 bomber dropped the world's first ever atomic bomb on the Japanese city known as Hiroshima. It wiped out nearly 90% of the city and almost immediately killed about 80,000 people. About 10,000 people later died of radiation exposure. The Japanese Emperor later announced the surrender of Japan from World War II. He said it was a new and cruel bomb. The Manhattan Project was a research project conducted by the United States that produced the first atomic bomb during World War II. The reason for this project was because American scientists were getting concerned that nuclear testing was starting in Nazi Germany. Over the years, many tests were tested while the scientists tried to successfully create a nuclear bomb. The first successful test of a nuclear bomb was the Trinity Test, conducted in New Mexico. During the bombing of Nagasaki, more than 73,000 people were killed. This bomb was dropped by an American B-29 bomber. It exploded about 1,625 feet above the ground, and it's believed to have destroyed the whole city.