sentences:  He was an anti-slavery advocate in the House, and his first act as a Congressman was to present a petition from residents of New York, which asked for slavery to be abolished in the District of Columbia.He also drew attention for his speech opposing the extension of slavery to Oregon Territory and the Republic of Texas when they joined the United States.Culver moved to Brooklyn, New York in 1850, where he established a law practice and became prominent as an advocate for New York City and Brooklyn abolitionists.