Answer:
After the U.S. battleship Maine exploded and sank in Havana harbor under mysterious circumstances on February 15, 1898, U.S. military intervention in Cuba became likely. ... That same day, Spain declared war on the United States, and the U.S. Congress voted to go to war against Spain on April 25.
Explanation:
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Technically the Alien and Sedition Acts were illegal because of the "First Amendment," since this guarantees the right to free speech, but they were issues under executive power--making them highly controversial.