You're kidding, right?
Everyone lost something, some lost everything, many gained a lot.
Democrats lost their virtual monopoly on power in Washington, DC, from ~1800 until secession in 1861, a loss they did not recover from until the Great Depression in 1932.
The South lost slavery, iirc, the nation's biggest single asset class at the time, and it lost its dominance over the Democrat party.
Today much of the South is prospering like never before, and its political leaders are important national figures.
And, as Republicans Southerners fit well with other "flyover" states' voters.
Bottom line: yes, the South lost a lot in the Civil War, but has since regained much -- the South has risen again.
