The United States Supreme Court declared that it was unlawful to discriminate in interstate travel.
The United States of America dropped its first-ever atomic bomb on the city of Hiroshima, Japan.
The United States Air Force firebombed Tokyo, Japan, killing over 100,000 civilians.
Franklin D. Roosevelt became the first and last US President to serve four terms.
United States civilians received ration books for the first time.
The US & Canada agreed to divert the Niagara River to protect the Niagara Falls from eroding.
Registration of US men aged between 21 and 31 began for troops for WWI.
The United States of America declared neutrality at the beginning of World War I.
The United States Department of Labor was formed.
The US used a national minimum wage for the first time in Massachusetts.
Colorado became the 38th state to join the United States of America.
Americans were introduced to bananas.
The United States bought Alaska from the Russian Empire.
The first US postage stamps were issued.
The United States Exploring Expedition set sail.
Missouri entered the United States Union and became the 24th state.
Maine became the 23rd state to join the United States of America.
The United States received its first elephant.
George Washington gave his first speech as the first President of the United States.
The first vice president of the United States, John Adams, was sworn in.
