What was the national debt to GDP ratio before income taxes were instituted? It wasn't even 10% between 1890 and 1910 --that's without the income tax.
The national debt increased because we increased the amount of the federal government does, it the income tax.
More than 100% of the net improvement is from tech and medical R&D, not the bloated military-welfare apparatus.
Bletchly Park? Military.
Hell, we were borrowing before we had states.