Unless you have a very subtle point that I'm missing, I think you got tripped up with the numbering of the centuries. The "19th century" started in 1801 and e

Unless you have a very subtle point that I'm missing, I think you got tripped up with the numbering of the centuries. The "19th century" started in 1801 and ended in 1900 (https://en.wikipedia.org/wiki/19th_century https://en.wikipedia.org/wiki/19th_century) putting the Civil War itself in the late-middle of the 19th century.