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German Submairnes (U-Boats) The Unrestricted Submarine WARFARE BY: Camreyn Hornos
Unrestricted submarine warfare is when the navy uses submarines to fight and sink other ships and submarine.
After Germany started using U-Boats (submarines) America got involved.
America got involved in WW1 because we gave a loan of $2.5 billion, Zimmerman note and Germany sunk 4unarmed American ships. Also gave some weapons
Since we were the last people to join the war no other country joined.
Also since we'd joined WW1 towards the end, we were the last country to join the allies we won.
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