In the early 1800s, the Beacon Hill neighborhood of Boston was home to one of the largest communities of free African Americans in the country. Unlike other U.S. states, Massachusetts effectively outlawed slavery in its constitution in 1783, decades before the 13th Amendment abolished slavery nationwide. Boston became a thriving center for the abolitionist movement and a critical link in the Underground Railroad. The historic site interprets 15 different structures in this storied neighborhood, including two important buildings, the Abiel Smith School and the African Meeting House, which combine to make up the Museum of African American History. Other historic buildings include a school, the homes of several prominent Boston African Americans and a memorial honoring the first regiment of African American troops to serve in the Civil War.