Say the US, who in the TL still participates militarily in WW1 & WW2, coupled with Lend Lease, return to long-term public fiscal isolationism.
I.E. No Foreign Aid, UN Contributions, Foreign Military Spending, etc.
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What else would the funds be spent on?
Infrastructure? Social Welfare? Budget Balancing? Something Else Entirely?
Would we Still Need to Come off the Gold Standard?