[Toddsterpatriot]

That's not a chart, that's a meaningless table.

Estimated declines in United States manufacturing output in selected sectors (1872–1876)^[26]

Industry	% decline in output
Durable goods	30%
Iron and steel	45%
Construction	30%
Overall	10%

From the source of your graph.

[Partisan Gunslinger]

Estimated declines in United States manufacturing output in selected sectors (1872–1876)[26] Industry % decline in output Durable goods 30% Iron and steel 45% Construction 30% Overall 10% From the source of your graph.

It didn't affect GDP. Industries evolve, resources get allocated differently.