Like the Presidential Dollar, the year of issue, mint mark, and motto "E Pluribus Unum" are found on the edge of the coin instead of on the obverse or reverse, which allows for more room for the design. Unlike the Presidential $1 coins from before 2009, "In God We Trust" remains on the obverse and the vacant space on the edge lettering has been taken up by thirteen stars, symbolizing the Thirteen Colonies. Also, unlike any other denomination of circulating U.S. coinage (but in common with the Presidential $1 coins), the value is inscribed in numerals on the reverse. The act passed by Congress requires that 20% of the total dollar coins minted in any year during the Presidential $1 Coin Program be Sacagawea dollars bearing the new design.