Why did the battle of okinawa happen

The American army wanted to win the Okinawa battle to be closer to Japan, gain a strong strategical advantage and cut the Japanese army off their supplies. It was the largest naval-land-aerial battle in history and the last great battle of World War II.

Explanation:

The battle of Okinawa (April 1945 - October 1945), also known as Operation Iceberg, was a part of the American military strategy to win the war on the Far East during World War II.

Okinawa was an important strategic place for the US Army, as the advantageous staging place on their route to Japan and its further invasion.