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Beginning in 1864, Chinese immigrants supplied most of the labor for the West Coast section of the Transcontinental Railroad. Approximately 10,000 Chinese worked on the consturction of this vital link.

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Beginning in 1864, Chinese immigrants supplied most of the labor for the West Coast section of the Transcontinental Railroad. Approximately 10,000 Chinese worked on the consturction of this vital link.

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Beginning in 1864, Chinese immigrants supplied most of the labor for the West Coast section of the Transcontinental Railroad. Approximately 10,000 Chinese worked on the consturction of this vital link.

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Violence against the Chinese would reignite in the 1880s. The Chinese Exclusion Act was passed and rioters, like these in Seattle, expelled Chinese from their communities.

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Violence against the Chinese would reignite in the 1880s. The Chinese Exclusion Act was passed and rioters, like these in Seattle, expelled Chinese from their communities.

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Violence against the Chinese would reignite in the 1880s. The Chinese Exclusion Act was passed and rioters, like these in Seattle, expelled Chinese from their communities.

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A family of Chinese immigrants in Honolulu, Hawaii in 1893.

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A family of Chinese immigrants in Honolulu, Hawaii in 1893.

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A Chinese family in Honolulu, Hawaii in 1893.

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Early officers of San Francisco’s Six Companies in traditional Qing dress, pictured around 1900.

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Early officers of San Francisco’s Six Companies in traditional Qing dress, pictured around 1900.

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Early officers of San Francisco’s Six Companies in traditional Qing dress, pictured around 1900.

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Transcontinental railroad over Donner Summit.

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Transcontinental railroad over Donner Summit.

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transcontinental railroad over donner summit

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Chinese workers on the Central Pacific Railroad.

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Chinese workers on the Central Pacific Railroad.

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Chinese workers on the Central Pacific Railroad.

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Chinese workers building a cut and a bank at Sailor's Spur in the Sierra foothills for the Central Pacific Railroad in California, 1866.

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Chinese workers building a cut and a bank at Sailor's Spur in the Sierra foothills for the Central Pacific Railroad in California, 1866.

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Chinese workers building a cut and a bank at Sailor's Spur in the Sierra foothills for the Central Pacific Railroad in California, 1866.

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Workers laying tracks for the Central Pacific Railroad in Nevada, 1868.

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Workers laying tracks for the Central Pacific Railroad in Nevada, 1868.

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Workers laying tracks for the Central Pacific Railroad in Nevada, 1868.

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African-American soldiers returning to their families in Little Rock, Arkansas, after the war captures the joyous spirit of many former slaves upon gaining their freedom.

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African-American soldiers returning to their families in Little Rock, Arkansas, after the war captures the joyous spirit of many former slaves upon gaining their freedom.

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African-American soldiers returning to their families in Little Rock, Arkansas, after the war captures the joyous spirit of many former slaves upon gaining their freedom.

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Blacks folks gathering dead and wounded from the Colfax massacre in Louisiana. Published in Harper’s Weekly on May 10, 1873.

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Blacks folks gathering dead and wounded from the Colfax massacre in Louisiana. Published in Harper’s Weekly on May 10, 1873.

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Blacks folks gathering dead and wounded from the Colfax massacre in Louisiana. Published in Harper’s Weekly on May 10, 1873.

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Union soldiers protecting a black froman angry Southerner.

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Union soldiers protecting a black froman angry Southerner.

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Former slaves on a plantation in Beaufort, South Carolina, 1862, courtesy of the Library of Congress.

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Former slaves on a plantation in Beaufort, South Carolina, 1862, courtesy of the Library of Congress.

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Former slaves on a plantation in Beaufort, South Carolina, 1862, courtesy of the Library of Congress.

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Juneteenth Emancipation Day Celebration, June 19, 1900, Texas.

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Juneteenth Emancipation Day Celebration, June 19, 1900, Texas.

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Juneteenth Emancipation Day Celebration, June 19, 1900, Texas

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Celebration of the Abolition of Slavery.

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Celebration of the Abolition of Slavery.

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Soldiers at the Battle of the Somme, 1916

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Soldiers at the Battle of the Somme, 1916

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Soldiers at the Battle of the Somme, 1916

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African-American soldiers marching in Verdun, France.

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African-American soldiers marching in Verdun, France.

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African-American soldiers marching in Verdun, France

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German infantry troops march through conquered territory along the Western Front.

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German infantry troops march through conquered territory along the Western Front.

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German infantry troops march through conquered territory along the Western Front