It exploded in Cuba is the event involving the Maine motivated the United States to go to war with Spain. Hence, option A is correct.
The American system wanted to defend the Spanish thriftiness while detrimental the Cuban one in order to longer their own ends.
The United States proclaimed war on Spain on April 25, 1898, following the descent of the War vessel Maine in the port of Havana on February 15, 1898.
Thus, option A is correct.
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