(A) Open Door Policy
(B) outbreak of World War I
(C) ** beginning of the Spanish American War
(D) Boxer Rebellion
EXPLANATIONS BELOW
Concept note-1: -On February 15, 1898, an explosion of unknown origin sank the battleship U.S.S. Maine in the Havana, Cuba harbor, killing 266 of the 354 crew members. The sinking of the Maine incited United States’ passions against Spain, eventually leading to a naval blockade of Cuba and a declaration of war.
Concept note-2: -In 1897, newly elected President William McKinley cautioned patience, but the explosion of the Maine shattered U.S. relations with Spain and led to a declaration of war on April 25, 1898. War with Spain caused the U.S. to rethink its long-held principle of anti-colonialism.
Concept note-3: -As Cubans were fighting for independence from Spanish colonial rule, President William McKinley ordered the Maine to Cuba to protect U.S. political and economic interests on the nearby island.