Throughout the Civil War, the American flag served as a potent symbol of the Union cause: Northerners flew it proudly, rallied around it, even put it on their stationery. These Civil War-era envelopes, digitized by the New-York Historical Society, feature an array of pro-Union slogans and images — President Lincoln, soldiers in Union dress — but the flag is a constant.The New York Historical Society/Getty Images "OUR HEARTS ARE WITH OUR BROTHERS IN THE FIELD." The New York Historical Society/Getty Images "THE STARS AND STRIPES MUST COVER THE WHOLE."
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