Most countries in southwest asia and north africa had achieved independence by which decade?

The correct answer is the 1950s.

There were some who managed to become independent even before world war two, but most of them did it later, in the 1950s. Of course, some did it through wars for independence, while some managed to get their independence politically without bloodshed. This caused a lot of problems at first because various people fought for power.

Is there any answer choices?