1. In 1926, the Washington Monument was dedicated on October 9. The monument was built in honor of George Washington, the first president of the United States.

2. On October 9, 1975, the first woman who served on the US Supreme Court, Justice Sandra Day O'Connor, was confirmed by the Senate. She served on the court for 24 years.

3. In 1781, American troops under General George Washington defeated the British army led by General Cornwallis in the Battle of Yorktown. This battle marked the end of the Revolutionary War and led to the recognition of the United States as an independent nation.

4. On October 9, 1919, the American Legion was founded in Paris, France by US military personnel who served in World War I. The organization has since grown to be one of the largest veterans groups in the US.

5. The Treaty of Greenville was signed on October 9, 1795, between the United States and several Native American tribes, including the Shawnee and Miami. The treaty ended the Northwest Indian War, which had been fought over control of the Ohio River Valley. Under the terms of the treaty, the Native American tribes ceded much of their land to the US in exchange for financial compensation.