The decolonization of africa and asia took place over a period of
days, following the end of wwii.
weeks, following the end of wwii.
years, following the end of wwii.
there are still colonies in africa and asia.

The answer is that it took years, following the end of WWII. Some of the colonies were granted their independence while others had to fight in order to gain their freedom from colonial power.  Some colonists though still retain some influence on their former colonies.

answer; ///the declaration of independence;