On September 20, 2007, , known as the Native American $1 Coin Act, was signed by president George W. Bush. The act specified in part that the one dollar coin shall depict "images celebrating the important contributions made by Indian tribes and individual Native Americans to the development of the United States and the history of the United States." The act also called for the removal of the date from the obverse and "E PLURIBUS UNUM" from the reverse of the coin, opting instead to add them to the edge. At this time the mintmark was also moved to the edge.