By Bad Seed
In Mein Kampf he wrote that the Germans was a nation that needed to expand like the British they needed colonies and Adolf Hitler was clear were they should find them. Mein Kampf: Adolf Hitler- "We are putting an end to the perpetual German march towards the south and west of Europe and turning our eyes towards the east and when we speak of a new land in Europe today we must princably bear in mind Russia, and the border states subject to her, destiny itself seems to wish to point the way for us here".
In Adolf Hitler's eyes Germany simply wasn't big enough so it was a must to seek out new land.
Speech Origin: The Nazis "A Warning From History" BBC Documentry