covenant as major departures from historic Reformed Presbyterian positions, causing some to leave and join the Reformed Presbytery. Perhaps the most enduring change during the 19th century involved participation in social reform movements. One cause favored by the denomination was the abolition of slavery, beginning officially in 1800, when members were prohibited from slave owning and from the slave trade. Enthusiastically supported by most members, the denomination took a strong stance against the Confederacy and faithfully supported the North in the Civil War, as Reformed Presbyterians enlisted to fight against the "slaveholders' rebellion." Abolition was a major factor in the decline of the denomination's South Carolina and Tennessee congregations: most members there, finding it hard to be abolitionists in slave-owning societies, moved to southern Ohio, Indiana, and Illinois; by the beginning of the Civil War, all of the old congregations in South Carolina and Tennessee were gone. The only congregations remaining in slave-holding territory were in Baltimore, Maryland, and in Roney's Point, Virginia (now West Virginia), near Wheeling. Another area of social activism focused on alcohol and tobacco. While drunkenness had always been prohibited, members were prohibited from the alcohol business in 1841, and by the 1880s, both church officers and ordinary members were prohibited from alcohol use. By 1886, tobacco use was strongly condemned as well, with ordination being prohibited to anyone who used it. As a result, the denomination explicitly supported the Eighteenth Amendment and other prohibition efforts for many decades. Immigration from Reformed Presbyterian churches in Ireland and Scotland provided sustained growth for the denomination. Some congregations, especially those on the East Coast, saw rapid growth; over ninety members, many of them immigrants, joined the Baltimore, Maryland, congregation in a single three-year period. Meanwhile, members moved west and many congregations were organized. In 1840, there were four East Coast city congregations and zero congregations west of the Mississippi River, the farthest west congregation being in southwestern Illinois. In 1865, there were nine East Coast city congregations and eight congregations west of the Mississippi, as far west as southwestern Iowa. In 1890, there were twelve East Coast city congregations and thirty-five congregations west of the Mississippi, as far west as Seattle, Washington. More presbyteries were organized as well: in 1840, there were 5; in 1850, 5; in 1860, 6; in 1870, 8; in 1880, 10; in 1890, 11. During the middle decades of the 19th century, the denomination