Presbyterians of different churches in the United States in 1906 numbered 1,830,555; of this total 322,542 were in Pennsylvania, where there were 248,335 members of the Presbyterian Church in the United States of America (the Northern Church), being more than one-fifth of its total membership; 56,587 members of the United Presbyterian Church of North America, being more than two-fifths of its total membership; 2709 members of the Synod of the Reformed Presbyterian Church of North America, three-tenths of its total membership; the entire membership of the Reformed Presbyterian Church in the United States and Canada (440), 3150 members of the Welsh Calvinistic Methodist Church, nearly one-fourth of its total membership; and 2065 members of the Reformed Presbyterian Church in North America, general synod, about five-ninths of its total membership. The strength of the Church in Pennsylvania is largely due to the Scotch-Irish settlements in that state.
Here too was signed (December 24, 1814) the treaty of peace between Great Britain and the United States of America.
As they had not been actually colonized by England, the republic of Buenos Aires claimed the group in 1820, and subsequently entered into a dispute with the United States of America concerning the rights to the products of these islands.
Treaties of friendship were concluded with Germany, Great Britain, and the United States of America.
In the United States of America the Appalachian mountain system, from Pennsylvania southward, roughly marks the line of the chief coal-producing region.