The Underground Railroad was an organized network of secret routes under ground and safe houses for fugitive slaves to escape to the abolitionist Northern United States and Eastern Canada during the era of slavery in the United States. Slaves escaped from slavery as early as the 16th century; many of their escapes were unaided. However, a network of safe houses generally known as the Underground Railroad began to organize in the 1780s among Abolitionist Societies in the North. It ran north and grew steadily until President Abraham Lincoln issued the Emancipation Proclamation in 1863. The escapees sought primarily to escape into free states, and potentially from there to Canada.