The US Army in the Second World War was the most mobile army in existence up until that time. There were more wheeled vehicles in use by the US Army than any other army of the day. It seems a bit odd to me that this army faced some of the worst terrain for mobile warefare, Central France, the Ardenne, The Vosage Mtns, The Palatinate, etc while the Brits were on the North German Plain with a less wheeled (but certainly far from leg dependent) army. With the US 7th Army set to come up the Loire Valley in late Summer, it would have made for some problems with the two US Army Groups (12th & 6th) seperated by the British 21st AG.

My question is: What would be the differences in the breakout and chase phases of the Northwest European campaign had the US landed on the left and the Brits on the right at Normandy? The question is not about the lodgement phase of the Normandy Campaign and assumes a roughly similar timeline up until 25 July 1944, only with each nations positions reversed.

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Best Regards,
JW