the entry of US troops.
The submarine.
No it wasn't. Boy if it had been it could have turned the war around almost immediately compared to the aircraft of that time. The A10 was first used in the Gulf war.
The battle of Saratoga
Nothing ´cause there is only 2 wars in all the World.
Tanks
The Serbian assassination of the Austrian Archduke Ferdinand.
The US turned into a superpower
Normandy
Albania turned communist
No. It is likely the USA would have gone to war with Japan but it may not have turned into a world war.
It turned the tide of war in Allied favour
The assassination of the duke, Franz Ferdinand started it. It turned into a world war because everyone was pointing fingers at each other