Where would the front line in the Balkans be at the end of 1943? Middle of 1944? Beginning of 1945?
I know OTL the U.S. objected to having any of its forces used in the eastern Mediterranean in OTL, but what if we get over that objection by having the U.S. set the same overall limits on Divisions and logistical support to the Mediterranean, and the same requirements to concentrate shipping and forces for a 1944 cross-channel invasion, but within the Mediterranean, the U.S. is open to suggestions from the British about where to operate and does not see Greece and the Balkans as any worse than Italy.
What if the WAllies invade Crete in July 1943, and then mainland Greece in September 1943? How do things proceed from there?
Have WAllied forces gotten past Greece's borders by the end of the war in Europe? (they had not gotten beyond Italy's borders). If they do, will they have mainly advanced from Greece into Bulgaria or from Greece into Yugoslavia? Would they reach the Danube from the south before the Russians reach it from the north or east? Could the Western Allies get to Bucharest and Ploesti faster than the Soviets?
As I note further up, the U.S. is still investing all the effort it did into the June 1944 D-Day and campaign in Western Europe as it did in OTL.
Within Greece, does earlier liberation lead to a more Italian style situation, where there is no armed civil war, just intense political competition, strikes, etc.?
What happens politically to Albania?