-
Albert Einstein Introduced His Theory of Relativity.
His formula has been called the world's most famous equation. He was awarded the Nobel Prize in Physics in 1921. -
Oklahoma Becomes the United States' 46th State.
Theodore Roosevelt was the president at that time. They wanted to become a state to gain representation in the U.S. government. -
Rocky Mountain National Park was Opened in Colorado.
President Woodrow Wilson passed the bill to make it a park. A dedication ceremony was held in Horseshoe Park. -
Babe Ruth Hit His First Homerun.
He hit the first pitch thrown by Yankee pitcher Jack Warhop. Eight thousand fans were there. -
World War II was Started.
The War involved more than 100 million people from over 30 countries. It was the deadliest war in history.