4. The Invention of the Atomic Bomb

In 1939, scientist Albert Einstein wrote to President Franklin Roosevelt warning him about the potential for Germany to develop an atomic bomb. This sparked the Manhattan Project, a top-secret project to build an atomic bomb for the United States. In 1945, the first atomic bombs were dropped on Hiroshima and Nagasaki in Japan, effectively ending World War II and ushering in the nuclear age.

The invention of the atomic bomb was a major scientific and technological achievement that ushered in a new era of warfare. It had profound implications for international politics, as it ushered in an age where global destruction could be achieved with a single weapon. The bombs caused immense destruction, killing thousands of people instantly and injuring many more. Its use also set off a nuclear arms race, as countries scrambled to develop their own atomic weapons in order to keep up with the other superpowers. The invention of the atomic bomb also had long-lasting consequences for international relations and foreign policy, as it made any future global conflict far more dangerous than before.