Gulian Crommelin Verplanck was an American attorney, politician, and writer. He was elected to the New York State Assembly and Senate, and later to the United States House of Representatives from New York, where he served as chairman of the influential House Ways and Means Committee.

The 21st United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from March 4, 1829, to March 4, 1831, during the first two years of Andrew Jackson's presidency. The apportionment of seats in the House of Representatives was based on the 1820 United States census. Both chambers had a Jacksonian majority.