19th-Early 20th Century (1856-1921)
The U.S. Mint began building steam-powered coining presses that were less labor intensive, paving the way for new jobs as well as new Mint branches across the country. In 1857, the U.S. Mint could produce enough coins for circulation, and Congress banned all foreign coins from circulation.
Coins from this era include the 1856 Flying Eagle Cent, 1878 Morgan Silver Dollar, 1907 Saint-Gaudens High Relief $20 Gold Coin, 1909 Lincoln Wheat Cent, 1913 Liberty Head Nickel, 1916 Mercury Dime, 1916 Liberty Walking Half Dollar, 1916 Standing Liberty Quarter Dollar, and the 1921 Peace Dollar.