The three 3 reasons why the US got involved in WWI are
1. Germany invading Belgium a neutral country which made America think that they might invade another neutral country which is them
2. The Zimmerman Note or The Zimmerman telegraph is a telegraph Germany sent to Mexico that they should invade/ attack the US, which was intercepted by the British who told the US about it.
3. Germany sinking our boat, the Lusitania killing 128 Americans because it had war supplies.