Why did General Tojo attack the Americas at Pearl Harbor?

Answer 1

Prior to the attack, America had given an ultimatum to the Empire: if Japan did not cease its aggression in China, the US, Great Britain, and Holland would cut off Japan's access to the oil of the Dutch East Indies. Tojo hoped that the attack on Pearl Harbor would be devastating enough to knock America out of the war entirely, or, failing that, America would recover from the blow so slowly that they would be unable to attack

before Japan had completed its conquests in China, Southeast Asia, and, possibly, India. The attack, designed by Yamamoto,

though successful on many levels, was not the knockout blow it was intended to be. The attack did not destroy the fuel depots for ships and aircraft, and none of the fleet aircraft carriers were caught in port, allowing them to spearhead the counterattack. Plus to top it all off, there was no plan for a followup attack, or to take advantage of the plan's success.

Answer 2

To eliminate the US (Main Battle Fleet at Pearl Harbor) from interferring with Japanese conquests.

Answer 3

Japan had plans of dominating China and wanted to destroy the U.S. naval base at the heart to prevent the U.S. from aiding China.