A result of Japan's attack on Pearl Harbor was:

A. the US formed a pact with Indochina against Japan.

B. the US formed a pact with Germany against Japan.

C. thousands of Americans died, and the US declared war.

D. thousands of Japanese people died, and Japan declared war

The answer is option C.

In December 7, 1941, the Japanese government launched an attack in order to prevent United States Pacific Fleet to intervene in the military operations Japan was going to held

in South East Asia and the Pacific, damaging plenty of ships, and taking thousands of lives. The United States, because of this unanounced military action, first not wanting to

intervene in war, declared war to Japan, ledding to the American entrance to World War II.