The statements you provided relate to historical events surrounding World War I, specifically the Zimmermann Telegram, in which Germany sought to encourage Mexico to join the war against the United States. Based on historical context, the following four statements can be deemed correct:
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Mexico accepted the German proposal - While Mexico did not formally accept, they received the proposal, which encouraged them to consider joining the war against the United States.
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Germany proposed to send financial assistance to Mexico - This is correct; Germany offered financial support to Mexico in the event that they joined the conflict.
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Germany planned to begin attacking passenger ships again in violation of the Sussex Pledge - This aligns with Germany's unrestricted submarine warfare policy during the war, which ultimately contributed to stirring conflict with the United States.
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Germany hoped to provoke the US to join the war and abandon their policy of neutrality - This statement is generally accurate, as Germany aimed to incite a conflict that would lead the U.S. to enter the war on the side of the Allies.
The statements regarding Germany's claim they could win the war in a few months and Mexico reconquering territory from the U.S. are more speculative and do not have the same level of historical documentation or consensus.