For 90 years after the last shot of the American Civil War was fired, the men who had fought for the Union and the Confederacy, respectively, continued to meet, and in doing so wielded considerable political power in the nation that had divided them.

For one, the Grand Army of the Republic (G.A.R.) brought together Union soldiers, referred to as "veterans of the late unpleasantness." Starting in 1866, only one year after the war's close, and ending with the death of 109-year-old Albert Woolson in 1956, the G.A.R. boasted 490,000 members at its peak in 1890.

A hugely influential body, the G.A.R. was instrumental in electing a number of U.S. presidents in the late 1800s, from the 18th (Ulysses S. Grant) to the 25th (William McKinley). Orators for the G.A.R. were caricatured as "waving the bloody shirt."