Everything else in 1940–45 was a consequence of this victory.
The back of the French army was broken. Hitler would gain control over western Europe (and Fascist Italy entered the war). Everything else in 1940–45 was a consequence of this victory. The German blunder of allowing the British Expeditionary Force to escape through Dunkirk was also significant; Britain would remain a threat, and Hitler’s victory was incomplete. But Stalin’s hope for a long mutually destructive war between the capitalist powers was undone; Russia itself was now threatened.