4:1 — The ratio of people who attended church weekly to those who voted in the 1860 election 2.5 — Approximate percentage of the American population that died in the Civil War 7 million ...

Reddit user Flynavy88 has created a chart documenting the total U.S. casualties suffered in each of these wars. U.S. casualties spiked drastically during the Civil War and World War II.

For decades, historians have cobbled together clues. But thanks to a newly released set of census records spanning three ...