What are negative and positive effects of World War 2?

There is no real answer because it depends on opinion. This is my oppinion so sorry if it's not what you're looking for. Positive; We developed a lot of new things then Negative; Weapons developed meaning more deaths Positive; Helped balance out populations Negative; They died horribly so I don't exactly agree with it Positive; Gave womankind a chance to prove they weren't useless Negative; At the end of the war the men acted like thy hadn't done anything.