Is this a joke?
Hitler was Austrian,with a (possibly) natural Jewish Father.He hated the Jews mainly because this Father left his Mother in poverty.
He wasn't attacked,he did the attacking.
He first invaded Austria,with the excuse that the Austrians wanted to be part of Hitler's Reich,many did,but equally many did not;but they had no choice.
When the rest of Europe did nothing he saw this as the green light to invade the "sudetenland"which was part of Czechoslovakia.It was only when he invaded Poland (with which we had a treaty guaranteeing them safety) that WW2 was declared.
Hitler claimed that all these invasions were to give German peoples "Lebensraum",which translates as "Living Room" or room for them to expand.It wasn't long before many Germans realised that Hitler was just another dictator invading as many countries as he could occupy and dominate.
Please don't try and tell me that Hitler was a poor innocent,with these nasty bully countries trying to destroy him because it won't work.
My wife was in one of Hitler's Concentration Camps,so I know a lot about it.I also served in WW2,so you could say I was an eye witness?
This question has to be a wind up,because I don't believe anyone could be so stupid as to ask it seriously!