They made it easier for him because they did nothing. They didn't want war so they stayed out of it for as long as they could. They just turned their heads and imagined this wasn't happening.
Austria was easier for Hitler to annex then Czechoslovakia because Austria had no allies to help defend itself and many Austrians accepted the Anschluss, or the unification, of Austria and Germany.
Control back of France for The Allies and to make it easier for V-E day (Victory Europe Day)
During the first part of WWII the allies were unaware of the consentration camps. Also if we were to bomb a consentration camp everyoe (including the Jews) would die. Doing that would have just made Hitler's job easier.
Made it easier for Mussolini to invade Ethiopia. Made it easier for Hitler to invade Europe. Used as a pretext to refuse any help to the French republic in 1939-1941, while France was at war against Hitler. Prevented FDR to offer more than consolation to Great Britain after the fall of France, until late 1941.
Nazi Germany had control of Normandy and Paris, France so The Allies pushed them back to Germany and took control of Normandy which made it easier to achieve V-E day (Victory Europe Day)
He could make a easier route from Europe to Asia.
It was formally a pary of Germany!
Spain (in addition to Portugal) and Sicily were not able to fight off Islamic influence as much as other areas. Arabs were able to conquer and immigrate easier to these areas than other parts of Europe. They are also fairly close to Northern Africa/the Middle East, which is where Islam originates and thrives.
Railroads made it easier to get to seaports in western Europe.
they were divided so they were weak against their enemies
The effects were that Germany's troops had to be spread out, if they fought on a single front Germany would not have to spread out troops, meaning more organization, and it would be generally easier for Germany to win the war.
easier to do it there than in a retirement home.