how did the Allies prevent a Axis victory in summer 1940 to late 1941?

by hotpineapple4211

How did The Allies counter the Axis and gain strength to ensure that war would become a long conflict? What did the Axis do or not do to fail to secure a victory when they had the Allies " on the ropes".

hotpineapple4211

Apologies on Grammar non native English speaker.