The answer for number 1 is c
I took a test question like this, do NOT pick selling war bonds.
It was the targeting of merchant ships by German
U-boats. America realized that any ship
including theirs was a target. This was
realized when the Germans sank the Luisitania.
Apart from that, the interception of the Zimmerman telegram where
Germany pledged to support Mexico get back its territories from the U.S. led to
American involvement in World War I.
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