The 1800's isn't modern civilization?
Were they living in caves or something?
In the 1800s there was no electricity or A/C and no running water. So, I would not consider the 1800s to be modern.
Our society is woefully soft and would not fare well without modern utilities. FReepers might do a better job of handling it than many others. One doesn’t have to necessarily be a hard core prepper to have emergency supplies on hand to at least survive a few months without walmart and grocery stores.