Before Germany invaded Poland in 1939 It only acquired what was taken from it as a result of loosing WW1. The victors WW1 did not find it to their advantage at the time to get involved in another war to hold on to these territory's. as they were still stugling with the aftermath of the great depression.
In 1939 Czechoslovakia was invaded by Nazi Germany
Nazi or National Socialist German Workers Party.
The Nazi party government in Germany in the 1930s
The Nazi Party, led by Adolf Hitler, rose to power in Germany during the 1930s. Hitler became Chancellor in 1933 and consolidated his power through a combination of propaganda, intimidation, and the suppression of political opposition.
The territory of their neighbors. Nazi Germany, Italy & Japan were consumed with the desire to conquer & enslave their neighboring nations.
Improve economic conditions in Germany
The Nazi's borrowed the swastika from eastern religions such ad Budhism. It wasn't created so much as it was adopted. I don't know the exact time period but i would say it was in the early 1930s.
Well, actually, Hitler was a fascist dictator.
By far the most important reason was growing persecution in Nazi Germany.
Nazi Germany created the extermination camps on occupied Polish territory. (Germany had invaded Poland in September 1939).
One reason that the Nazi programs and policies appealed to the people of Germany was that they were frustrated with the state of their current government. The people were also unhappy about the current economic situation.
In 1932 Austria became a Fascist dictatorship, but less oppressive than many. Then, in 1938, it was annexed by Nazi Germany.