George Mifflin Dallas, an American statesman, son of the preceding, born in Philadelphia, July 10, 1792, died there, Dec. 31, 1864. He graduated at Princeton college in 1810, studied law with his father, and was admitted to the bar in 1813. Albert Gallatin having been appointed in that year one of the commissioners to negotiate a treaty of peace, Mr. Dallas accompanied him as private secretary to St. Petersburg and in 1814 to Ghent, whence he returned to the United States with despatches. After assisting his father for some months in the treasury department, he entered upon the practice of his profession in Philadelphia, and became solicitor of the United States bank. In 1817 he was appointed deputy attorney general for Philadelphia county. He was elected mayor of Philadelphia in 1828, and resigned that office the next year to become United States district attorney. In 1831 he was elected by the democrats to fill a vacancy in the United States senate, where he advocated a protective tariff and the recharter of the United States bank. His term of office expired March 4, 1833, and he then became attorney general of Pennsylvania, and held the office till 1835. In 1837 he was appointed minister to Russia, and was recalled at his own request in 1839, when he resumed the practice of law.

He was elected vice president of the United States in 1844, Mr. Polk being elected president. Although Mr. Dallas had been understood to be a protectionist, the senate being equally divided on the free-trade tariff of 1846, it became a law by his casting vote in its favor. His term of office as vice president expired March 4, 1849. In 1856 he succeeded Mr. Buchanan as minister to England. The most important questions that arose while he was minister were those which related to Central America, and to the request made by the United States for the recall of Sir John Crampton, British minister to the United States. Both these questions were amicably settled. In 1861 he was succeeded as minister by Mr. Charles Francis Adams, and retired to private life. During the civil war he strongly supported the cause of the Union.