“He was born in the city of New York in 1795; was graduated at Columbia College in 1810, and entered commercial life, which he soon abandoned for the study of the law. He removed to Louisiana in 1825, and was shortly afterwards admitted to the bar of that State. In 1829 he was appointed United States district attorney for the Louisiana district by President Jackson, and from that time took an active part in the politics of the State. He was soon recognized, not only as one of the ablest and most careful lawyers, but as the practical political head of the Democratic party of the Southwest.
“In 1842 he was elected to Congress from the New Orleans district. In 1845 he was appointed by President Polk as minister to Mexico. This mission was foredoomed to failure. The annexation of Texas made a war with Mexico inevitable, but the broad sense shown by Mr. Slidell in his despatches from Mexico was fully recognized by the administration of President Polk, and his views were maintained, and his advice was followed, to the time of the breaking out of hostilities.
“In 1853 he was elected to the United States Senate to fill an unexpired term, and in 1854 was again elected for a full term, which had not expired when the secession of Louisiana in 1861 put it at an end.
“He was shortly afterwards sent to France as a commissioner on behalf of the Confederate States. On his voyage to that country he was taken from the British steamer ‘Trent,’ and was imprisoned at Fort Warren in Boston Harbor. His release by President Lincoln, under the advice of Mr. Seward, will be remembered as one of the most exciting and important incidents in the early history of the war. He remained in Paris as the Commissioner of the Confederate States until the termination of the rebellion, and during that period was probably the most active and effective agent of the Confederacy abroad.
“His influence with the government of Louis Napoleon was very great, and at one time, chiefly through his persuasion, the emperor, as Mr. Slidell believed, had determined to recognize the Confederacy; but fortunately this political mistake was averted by the great victory gained by General McClellan over the Confederate army at Antietam.