In late 1940 after pressure from Hitler, Fransisco Franco declares war on the United Kingdom and invades Gibraltar. Fransisco Franco also assists the Germans and Italians in North Africa.
Lets say the the Axis take control of Gibraltar and the Suez, then they invade the Middle East. Nazi soldiers invade Israel and TransJordan. Jewish immigrants to Israel fight back yet they are eventually rounded up and slaughtered. A concentration camp is set up in Israel and the rest of Allied territory in the Middle East is conqeuered. Operation Barbarossa takes place at the same date as in our timeline yet how would World War Two have turned out differently if Fransisco had joined and after several successes both the Suez and Gibraltar would be under Axis control?
Well troops from North Africa and the Middle East would be shipped to the Eastern Front since a british invasion would be less of a threat now. Maybe through Persia or Arabia, but that would mean travelling around all of Africa for the British. Also supplies and manpower from British Asia takes longer time to arrive in England.