Hitler was able to dismantle German democracy in 53 days when he was appointed chancellor in 1933
In a book by Timothy Ryback, Adolf Hitler and his Allies came into office in 1933 and systematically destroyed German democracy and checks and balances subverting the institutions meant to keep a check on him.
He rebuild the army and navy and Air Force and his rapid militarization made the expansion into Alsas Loraine and Austria and Czechoslovakia and eventually Poland inevitable.
But all of this started with the subversion of democratic institutions. He couldn’t get the money to rebuild the military industrial complex without this. The racial and ethnic laws would not have been possible.
That being said the rise of Hitler also shows that it wasn’t inevitable there was a possibility of Hitler never coming to power or being severely curtailed in the Reichstag by liberal and moderate politicians.