Yes, actually, he will still be in that race as his goal will still be to divide the British and to starve them out of the war, which the Germans lost the capacity to do due to effective use of the convoy system. QUOTE]
Not sure what you mean. Even if correct, how does this put Ludendorff into any particular race against time? [1]
Also, with a neutral America no longer exporting much food, the Allies have major shipping problems. About the next nearest alternative is Argentina[2], more than twice as far away. So any given number of ships could do less than half as many voyages per month as they could to North America. Thus the effect of such a change is equivalent to 50% of the ships having been sunk - a notional "kill rate" far exceeding anything ever actually achieved.
Ironically, a German victory in France might actually help Britain with her own supply situation, since the ships previouly used to supply France, Italy et al would become available to carry food to the UK. But with her continental allies gone, and no prospect of American support, there'd be nothing to do except make peace on the best terms she could get.
[1] All this of course is assuming that the war even lasts into 1918. However, in the absence of unsecured US loans, Britain will find herself unable to subsidise her continental partners, who were financially dependent on her and might well be obliged to make peace. In that case, of course, even if the war continues at sea for a time, there will be no 1918 campaign as we know it.
[2] That's being optimistic and assuming that Argentina can be persuaded not to suspend grain exports, as she did OTL in Feb 1917. Otherwise, food must be imported from even further away.
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