To pay for the Civil War Federal spending rose from its historical average of around 2% of GDP in 1860 to peak at 13% of GDP in 1865, while national debt rose from $65 million in 1860 to nearly $3 billion in 1866, then about 33% of GDP.
It took until 1880 to reduce spending below 3% of GDP and until 1890 to get the national debt down to 10% of GDP.
Those numbers never fully returned to pre-war averages.
By stark contrast, today's Federal spending & debt are both way off the charts.
No argument there.