Mike it has to be remembered that hitler was never really interested in conquering westwards ( not say it wouldn't have hapened eventually). He followed what he wrote in his book pretty closely and what he wrote was that he wanted to conquer russia up to the ural mountains....
Now for my what ifs ;D
ww2-
-What if operation barbossa had been launched on time and not delayed a month, what if the divisions ahdn't been given constantly changing objecvives and instead focussed on taking moscow first. If this had happened moscow would probably fallen, and since the country was tied to moscow it could therefore be rolled up and easily defeated. Thus freeing up troops and resources to fight the allies on the western front.....
-What if Hitler had unleashed his submarines from day one of the war. After all Churchill did say that they were the only thing that worried him during the war....
-What if hitlers car had not gotten a flat tire and the bombing run missed him by 15 minutes....
-What if Hitler had been shot in world war one (remember reading an article on a soldier he realized later that he had had him in his sights in ww2, said soldier had recieved a medal for his bravery that day)
-What if the few escort carriers and destroyers had not gone up against a japenese force consisting of heavy cruisers and battleships and battle against them till the japenese turned back. Thus saving the us landing forces in the philipines( I believe these were the islands) from japenese naval bombarment.... ( note: unit won a presidential citation for its actions. The The destroyers charged the enemy fleets and torpedoed them, while the excort carriers aircraft did what they could to hurt the enemy)
And on to a different era....
-What if napoleon had joined the royal navy as a youth ( as was hs first choice)
-What if Nelson had not attacked at the nile when conventional stategy dictated not to. The french army would have had a free hand in eygpt, not been crippled like it was.
-What if napoleon had not been allowed to escape. The war wouldn't have had that brief flair up, there wouldn't have been another peace conference. Brittians forign minister wouldn't have gotten to put his plan of a balance of power and Brittian as the worlds policeman. As a purely imperial power Brittian could have justified strangling euroupe into submission with its navy....
-What if Lord Cochrane had managed to pick up Napoleon and install him as emperor of chile. This one is a garenteed fact. Cochrane had a major part in chilean independence, weather prevented him from picking up napoleon on his way to chile and napoleon died before he could pick him up after chile was liberated. Despite fighting with a sucsess record short of only Nelson Cochrane was in disfavour with the admiralty for his actions hence his taking up a job offer with chile, and despite fighting against napoleon he admired him.
And back a little further in time....
-What if Cromwell had not seized power in england. It was during this time that the royal navy was provided with a permament financial base and was reformed in terms of effeciency morale and organizations, giving it the edge over all other navies in europe.....
-And although I'm running out of time lets go back a little further yet....
What if rome had remained a republic and continued its expansion over europue and the rest of the world, rather than becoming increasingly dependent on the emporer's direct orders. This killed the ability of local govenors to deal with crisis and rebellion, and killed expansion as the emperor could not trustanyone to command armies for conquest lest they get enough glory to challenge him, and since he couldn't lead the armies ( leaving rome open to an usurper) expansion ceased and from this the empire decayed...
and just cause I'm on a roll lets go to the us civil war....
-What if at gettysburg the confederacy had managed to gain the high ground and won the battle.... leaving them free to march on washington. They were held off by a single company wich used superior tatics to hold off and then out of amuntion rout the enemy...
-What if brittin had done more than just build the confederacy ships, wat if they had declared war...
What if indeed... ( dramatic music)
Man I wished I had more timt to ramble....
(Excuse me if I have any minor errors in facts goin from memory)