Telegram 158
We intend to begin on the first of February unrestricted submarine warfare. We shall endeavour in spite of this to keep the United States of America neutral.
In the event of this not succeeding, we make Mexico a proposal of alliance on the following basis: make war together, make peace together, generous financial support, and an understanding on our part that Mexico is to reconquer the lost territory in Texas, New Mexico and Arizona. The settlement in detail is left to Your Excellency.
Your Excellency will inform the President of Mexico secretly as soon as the outbreak of war with the United States is certain, and add the suggestion that he should invite Japan to immediate adherence. Please call the President's attention to the fact that the ruthless employment of our submarines now offers the prospect of compelling England to make peace within a few months.
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