Because there were messages intercepted from Germany to Mexico, telling Mexico to join the war and attack the United States. I hope this helps :)
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whats the question i n words-_-
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The Progressive Era Summary
The Progressive Era (1896–1916) was a period of widespread social activism and political reform across the United States of America that spanned the 1890s to World War I. Progressive reformers were typically middle-class society women or Christian ministers.
Spain losing it's New World Empire and both of it's Naval Fleets
