The Missouri Centennial half dollar is a commemorative fifty-cent piece struck by the United States Mint in 1921. It was designed by Robert Ingersoll Aitken. The US state of Missouri wanted a commemorative coin to mark its centennial that year. Legislation for such a coin passed through Congress without opposition and was signed by President Warren G. Harding on his inauguration day, March 4, 1921. The federal Commission of Fine Arts hired Aitken to design the coin, which depicted Daniel Boone on both sides. The reverse design, showing Boone with a Native American, has been interpreted as symbolizing the displacement of the Indians by white settlers.