The united states became officially involved in world war ii when?
o a. germany declared war on france.
o b. congress declared war on japan.
o c. germany declared war on great britain.
od. congress declared war on germany.

The correct answer is B: Congress declared war on Japan.

Explanation:

In 1941, Japan occupied Indochina and acquired valuable sources of material goods and materials. Their next plan was to attack East India, because of its oil sources. The US responded to this by an oil embargo that particularly hit the Japanese Navy. The Japanese government decided to occupy East India, although it brought them an armed conflict with Britain and the US.

As a further warning, the US government had moved most of its Pacific fleet from San Diego to Pearl Harbor. That was a great opportunity for Japan to gain dominance in the Pacific and conquer the rest of Asia.

On December 7, 1942, the US base (Pearl Harbor) was attacked by Japanese aircraft which damaged a large number of ships and aircraft. This attack, carried out without a formal war declaration, caused great anger among the American public and the Congress decided the USA should be involved in world events and declared war on Japan.

i believe the answer is c