Well. You must know something history doesn't about "stopping" Hitler prior to 1938.<quoted text>
Of course they could have done something. They could have stopped Hitler dead in 1938 even. Actually, they could have stopped him in 1935. Hitler succeeded due to a range of high-risk gambles that only worked due to the ineptitude of the Western democracies to do something. FIne enough, but then these same "freedom loving" nations cannot proclaim any moral high ground either. Likewise, how many raids did the allies launch upon concentration camps? They probably knew to a higher and more systematic extent what was going on than the average German civilian and even most of the armed forces.
The brits could have stopped it and so could the french. Well, in case of the french, could have TRIED may be more fitting, LOL.
Simply alluding to a date doesn't mean a thing.