What was d-day and why was it the defining moment of world war 2?

DDay was one of the biggest attacks in the war. It had mostly Americans fighting the japs but some Germans and soviets. It's lasted

For days, weeks.and within the first 30 of it 150,000 people

Lie dead

In the water and 200,000 and more wounded. Many soldiers were ranked up because there sergeants or whoever got shot. It was a very important battle it the war. It weaked the japs and Germans a lot!