1. Anschluss, linked up Austria and Germany into a single German Nation
2. Occupation of Sudetenland, a German area of Czechoslovakia, linking Germans together. Rest of Czechoslovakia, Hitler saw a chance to gain some more land, and thanks to the Western Allies not caring, he took it.
3. Poland did not want to give up the Danzig Corridor, so he took it by force, remember Danzig ist Deutsch und gehoert zu Deutschland (Danzig is German and Belongs to Germany).
From then on nobody can justify what happened. The other invasions were purely militaristic. Norway was need for U-boat bases and Naval bases. France, well this is easy, Paris fell in 1871, Paris almost fell in 1914, so time to get it in 1940!
The attack on Russia, one simple reason, look what happened after, a cold war with the "red threat", the curtain took everything into it, Poland, Ukraine, and yes Czechoslovakia, which dug up its streets to no avail. Eastern people thought they were free when the Reds came but it started an even more darker nightmare.
The plot against Hitler existed WAY BEFORE the war! Why didn't they stop him, well why didn't they stop Erich in East Germany, they couldn't. Germany was infested with Gestapo. You couldn't even talk at home. Everybody was scared. Same reson they didn't get rid of Stalin. That was the reason why so many East Germans fled to Czechoslovakia during the 60's and 70's, to get away.
It was not the people who started the war. It was one power hungry Austrian Painter who happened to control the best army in Europe. To Hitler you didn't just say no, you did it you you died!
Try to talk to amy German Grandmother who got bombed and strafed and tell her that they wanted it so it is her fault. Try to tell that to Veterans who at the time where 12 year old boys manning flak guns and trying to stop the bombers, tell that to the 10,000 people on board the Whilhelm Gustloff when she was sunk in January 1945, of which 9,000 people perished.
Believe me, I speak for all German people who had to endure those times. They did NOT want to see another war again. Sure there were the few that did but the majority did not. Germany sat on a knife edge that first week of September 1939 wondering there fate. There were no civilians cheering on the troops. Sadly it was those few who did that were the leaders.
Germany was in a state the same kind that France was when Napoleon took power, and that Russia was when the Lenin-Stalin grough took power.
I think that I've said enough, think what want, but don't tell anybody that they asked for it. That is like saying....Well Poland wouldn't let Germany re-unify, so they, as a country trying to keep a people split, they had it coming................