The one that Revealed Germany's attempt to ally with Mexico against United states was :
A. the Zimmerman telegram
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Willingness to work the land for Europeans
Answer
Coal spontaneously combusted
Explanation
There are many theories for the cause of the United States the USS Maine explosion with Us men aboard where many died. According to the United States Naval Investigative team team their research concerning this incident , they came to a conclusion that the explosion was caused by fire that had ignited the ammunition stock. According to these investigators there was a strong evidence that the explosion of Maine was caused by an internal coal fire which ignited the magazines. This was a likely cause of the explosion, rather than the initial hypothesis of a mine
Joseph Stalin was ( c ) a cruel leader of the Soviet Union. After Lenin´s death Stalin took over as leader of the Soviet Union. He believed that he should change the country from agricultural to industrialized, building factories all over the Soviet Union. He is known for his cruelty. He order several "purges" in which people he thought were against him would be killed or sent to slave labour camps.