Why did Germany divide after World War I and who controlled the country?

I believe you are referring to the division of Germany after World War II. Germany was split into four zones after World War II. The Allies believed a united Germany was too dangerous. Within a span of 20-25 years, Germany was involved in the start of two world wars. They Allies didn’t want to take the chance that Germany could head down the path of war again. Thus, they split Germany into four zones. One zone was controlled by the United States. France controlled the second zone. Great Britain controlled the third zone, and the Soviet Union controlled the fourth zone.

Eventually, France, Great Britain, and the United States merged their zones into the country called West Germany. The Allies believed the Soviet Union was trying to undermine Germany’s economy so they could spread communism to all of Germany. We didn’t want communism to spread to the Allied zones, so they were merged. The Soviet Union then formed the country of East Germany.