I can not put the word "prohibition" together with the US I see from here today. So, what was the reason for prohibition during the early 20th. century? Politics, Economics, Religion, anything else?

Well, sometimes people talk about the prohibition times and I wonder it...

By the way, maybe this is not the righ place for this thread...I'm not sure, so please accept my apologies, if there's sth. wrong with this thread.