On August 6, 1945, during World War II (1939-45), an American B-29 bomber dropped the world's first deployed atomic bomb over the Japanese city of Hiroshima. The explosion wiped out 90 percent of the city and immediately killed 80,000 people; tens of thousands more would later die of radiation exposure.
Explanation:
The northwest ordinance basically set up a system of government for the Northwest territories (Indiana, Ohio, Illinois, Kentucky, Michigan, Wisconsin), and stated the requirements needed for land to become a state.
I think the most important event was when the pilgrims came to the Americas. Although they came there to escape persecution, they were the first to start a colony and life there. Once that colonization started, many other European also wanted to come to the Americas to find more freedom and escape persecution.
