The key outcome of the Battle of Midway was:

The key outcome of the Battle of Midway was that the United States successfully turned the tide of war in the Pacific. This battle, fought in June 1942, was a decisive naval conflict that significantly weakened the Japanese fleet. Prior to Midway, Japan was on the offensive, rapidly expanding its territory and power in the Pacific after its successes at Pearl Harbor and other engagements.

The successful ambush of the Japanese fleet at Midway, largely due to significant intelligence breakthroughs and a well-executed plan, led to the sinking of four Japanese aircraft carriers. This loss created a critical shift in naval power, as Japan was unable to replenish or replace these carriers quickly. The result was a transition from defensive postures by the Allies to a series of offensive operations in the Pacific, ultimately leading to the eventual defeat of Japan.

This battle demonstrated the importance of aircraft carriers and air superiority in naval warfare, shaping future strategies. Thus, the outcome of the Battle of Midway is considered a pivotal moment in World War II, marking the beginning of a shift in momentum toward the Allies in the Pacific theater.