Question

When was Sudetenland annexed?

Answer 1

The Sudetenland was annexed between the 1st and 10th of October 1938.

Explanation:

After the annexation by Germany the Czech part of Czechoslovakia, where the Sudetenland was located, was invaded by Germany and was partly annexed and the remaining land was established as The Protectorate of Bohemia and Moravia. The Slovak part however declared independence from Czechoslovakia and became the Slovak Republic, a satellite state of Germany.

The reason for Hitler's want to take the Sudetenland was that he argued that the German population in the area had been mistreated by the Czechs. Although, he might've also wanted these lands due to the extensive defense perimeters the Czechs had put up there.