William Wirt (Attorney General) in the context of "United States Attorney"

Salmon Portland Chase (January 13, 1808 – May 7, 1873) was an American politician and jurist who served as the sixth chief justice of the United States from 1864 to his death in 1873. He earlier served as the 25th United States secretary of the treasury from 1861 to 1864, during the American Civil War in the Abraham Lincoln administration. Chase also served as the 23rd governor of Ohio from 1856 to 1860, and represented Ohio in the United States Senate from 1849 to 1855 and again in 1861. Chase is therefore one of the few American politicians who have held constitutional office in all three branches of the federal government, in addition to serving in the highest state-level office. From the 1850s onward, even as Chief Justice, Chase sought a presidential nomination that never came because he was considered inept.

Born in Cornish, New Hampshire, Chase studied law under Attorney General William Wirt before establishing a legal practice in Cincinnati. He became an anti-slavery activist and frequently defended fugitive slaves in court. Chase left the Whig Party in 1841 to become the leader of Ohio's Liberty Party. In 1848, he helped establish the Free Soil Party and recruited former President Martin Van Buren to serve as the party's presidential nominee. Chase won election to the Senate the following year, and he opposed the Compromise of 1850 and the Kansas–Nebraska Act. In the aftermath of the Kansas–Nebraska Act, Chase helped establish the Republican Party, which opposed the extension of slavery into the territories. After leaving the Senate, Chase served as the first Republican governor of Ohio from 1856 to 1860.

Gibbons v. Ogden, 22 U.S. (9 Wheat.) 1 (1824), was a landmark decision of the Supreme Court of the United States which held that the power to regulate interstate commerce, which is granted to the U.S. Congress by the Commerce Clause of the U.S. Constitution, encompasses the power to regulate navigation. The decision is credited with supporting the economic growth of the antebellum United States and the creation of national markets. Gibbons v. Ogden has since provided the basis for Congress' regulation of railroads, freeways and television and radio broadcasts.

The case was argued by some of America's most admired and capable attorneys at the time. The exiled Irish patriot Thomas Addis Emmet, as well as Thomas J. Oakley, argued for Ogden, and U.S. Attorney General William Wirt and Daniel Webster argued for Gibbons.