The event that finally caused to ask Woodrow Wilson for the declaration of war against Germany was the announcement of a policy of unrestricted submarine warfare by Germany on February 1, 1917, and the sinking of the American cargo ship Housatonic on February 3, despite their previous promises of leaving American ships alone.
By that time Wilson had already decided to break relationships with Germany, and such decision was reaffirmed when, days later, the U.S. received the Zimmermann Telegram, a secret message decoded by Britain, in which the German foreign secretary Arthur Zimmermann proposed Mexico an alliance in the case of war between the U.S. and Germany, promising Mexico financial and territorial rewards for its support.
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Explanation:Las principales causas de la Guerra Fría se pueden resumir en:
La Unión Soviética quería difundir su ideología comunista a todo el mundo, lo que alarmó a los americanos, que odiaban ese sistema político.
La adquisición de armas atómicas por parte de los americanos alertó enormemente a los soviéticos.
Ambos países temían el ataque de uno u otro.
El presidente estadounidense sentía una aversión personal contra el presidente ruso Josef Stalin.
Los soviéticos temían que Estados Unidos utilizara a la Europa occidental como base para atacar a la Unión Soviética