<human>:  What historical events happened on June 18th?
<bot>: On June 18th, 1778, American forces under the command of George Washington defeated the British at the Battle of Monmouth. In 1812, the U.S. declared war on Britain, beginning the War of 1812. On June 18th, 1815, Napoleon Bonaparte was decisively defeated at the Battle of Waterloo by British and Prussian forces. On June 18th, 1983, the U.S. Supreme Court ruled in INS v. Chadha, striking down the use of the legislative veto. In 1994, the U.S. Senate voted to end its policy of excluding gays and lesbians from the military, otherwise known as "Don't Ask, Don't Tell".