What event did President McKinley use to justify his decision to ask Congress for a declaration of war against Spain?

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The explosion on the USS Maine in Havana Harbor on February 15, 1898, was a significant event that President William McKinley used to justify his decision to ask Congress for a declaration of war against Spain, leading to the Spanish-American War. The sinking of the Maine, where 266 American sailors died, was blamed on Spain by the American public and press, increasing the pressure on McKinley to take action.

What Event Did President McKinley Use to Justify His Decision