Political History of Progressive Era, Imperialism, and the Nadir of American Race Relations (1880s to 1920s) Creating Columbus Day (Beyond the Bubble)Video Resource: Primary Source Analysis: Contextualization-Columbus Day (History Forge)Primary Sources: Plessy v. Ferguson (Newsela, free account)Changing The U.S. Constitution-19th amendment (Newsela, free account)Anarchism and the Haymarket Affair (Beyond the Bubble)Haymarket Aftermath (Beyond the Bubble)