We're assuming an independent Scotland, then?
Anyway, while you're doing that the Balance of Power shifts to a catastrophic degree towards China in asia and Russia in Europe.
Without American backing Israel looks like a soft target and a new and bloody war breaks out between Israel and the non-genocidal Levantine States on one side, and everyone else on the other.
Without American leadership military co-operation in Europe unravels into smaller blocks, the UK likely withdraws from the EU as a result, Germany either becomes the axis on which everyone turns, or abdicates responsibility - lots of nasty ways for this to go, including opportunistic Russian Invasion.
China begins to threaten Japan openly - lacking American backing Japan aggressively re-militarise....
All HELL breaks loose.
I sympathise with your desire to downsize your military commitment, but isolationism just ends up dragging the US into the war late, rather than keeping you out.
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