"A. The battle stopped a Japanese attack on Hawaii and put the Japanese on the defense,"
The battle of Midway, between 4th and 7th July 1942, was a turning point for the war in the pacific because the battle stopped a Japanese attack on Hawaii and put the Japanese on the defense. By making the Japanese retreat in defense, the Americans could focus on attack, not having to worry about a possible attack in the American territories by the Japanese empire.