Franklin Mint – History of the US – US Enters WWI – 1917 – 45mm – Proof Bronze Medal – Feb 1 – Germany begins unrestriced submarine warfare – Mar 1 – Anti-German feeling is increased by publication of the Zimmerman note – Apr 6 – U.S. and Germany at war – Apr 24 – Liberty Loan Act to finance war – May 18 – Selective Service begins call to the colors.