FDR committed many unconstitutional moves that he can be blamed for.
This isn't one of them.
The US bore the brunt of the financial cost of that war.
“FDR presided over the largest, longest running World War in history.
What kind of idiot comparison is that?”
I think President Truman and the Republican Congress did a good job a cleaning up the war debt
They balanced the budget in 1947, 1948, 1949, 1951 and 1952
On 30 June 1953 the national debt was 266,071,061,638.57
It had only increased by $7 Billion in the 8 years of President Truman.