"Surrender, in black and white"
(Library of Congress)
The impact of the Manhattan Project was the end of World War Two. After the Manhattan Project ended the bombs were put to use and dropped on the cities of Hirosima and Nagasaki, Japan (The Atomic Bombings of Japan). The Japanese surrendered not long after the bombs were dropped. After this, tensions grew for a variety of reasons, one mainly being a race for nuclear weapons, called the Cold War (Manhattan Project).