The cartoon was published on February 1, 1917. The letter from Germany to Uncle Sam reads; "Ruthless warfare at sea. Ships enter blockade zone at their risk. Pledges as to warnings cancelled." What was the effect of the message shown in this cartoon?
A.The United States declared war after the U.S.S. Maine was blown up in Havana Harbor
B.The United States declared war after Germany sank American ships in the blockade zone
C.The Zimmerman telegram offered Texas and California to Mexico in exchange for an alliance
D.Germany announced it would not attack passenger ships or merchant ships without warning
