> I believe the US didn't enter until the sinking of the Lusitania.
The Lusitania was sunk in 1915, the US only entered WWI in 1917, mostly because Germany had recommenced unrestricted submarine warfare and proposed an anti-US alliance to Mexico (the famous Zimmermann telegram).
The Lusitania was sunk in 1915, the US only entered WWI in 1917, mostly because Germany had recommenced unrestricted submarine warfare and proposed an anti-US alliance to Mexico (the famous Zimmermann telegram).