The Battle of Midway proved a crucial victory for the Americans in the Pacific because - * It allowed the US to take control of islands from which they could attack Japan
It gave the Allies the advantage in the Pacific.
Shortly after the Japanese realized their weak position and surrendered
A majority of the Japanese aircrafts were destroyed making future attacks easier

The Battle of Midway gave the allies an advantage in the pacific. This is because the US forces there destroyed four aircraft carriers, causing major damage to Japanese naval air forces to the point they couldn’t replace them in time before the war ended.

Here are why the other answers are incorrect:

The island of Midway was actually under US control before the attack, and was too far from Japan for attacks to be held there. However, it was a crucial airbase that had to be kept for control of the local region.

The Japanese took a few more years to surrender, but some historians consider this battle to be a turning point in the pacific campaign.

The majority of carriers were not destroyed at midway, but as stated above, the destruction of four proved to be a crucial victory, since the Japanese couldn’t replace them in a timely manner.

Hope this helps!