When the Dutch and Swedes established colonies in the Delaware Valley, they quickly imported African slaves for workers, or transported them from New Netherland; slavery was documented as early as 1639. William Penn and the colonists who settled Pennsylvania tolerated slavery, but the Quakers and later German immigrants were among the first to speak out against it. Many Methodists and Baptists also opposed it on religious grounds and urged manumission during the Great Awakening. High British tariffs in the 18th century discouraged the importation of additional slaves, and encouraged the use of white indentured servants and free labor.