In 1837, he resigned his commission the day before his father's inauguration to become the president's private secretary in the White House. Van Buren's career in the White House ended when his father was defeated by Whig candidate William Henry Harrison in the presidential campaign of 1840. Van Buren and his wife Angelica left Washington in March 1841 after Harrison's inauguration. Their first visit was with Angelica's family in Sumter, where Angelica gave birth to their first son, Singleton.
Return to Army
In June 1846, at the outbreak of the Mexican–American War, Van Buren was reappointed to the regular army as a paymaster with the rank of major. In spite of his absence while serving in the military, Van Buren still enjoyed close relations with his father. When the former president renovated and expanded his estate Lindenwald, located in Kinderhook, New York, during the years of 1849 to 1851, a corner room on the second floor opposite the master bedroom in the original home that was built in 1797 was reserved for Van Buren and his wife. The couple would enjoy extended stays with the former president along with Van Buren's surviving brothers John, Martin, Jr., and Smith Thompson. Van Buren and his family continued to winter at their plantation in South Carolina. Van Buren served for eighteen years in the army as an officer, but never rose above the rank of major. In August 1847, he was made a brevetlieutenant colonel for gallant and meritorious conduct during the battles of Contreras and Churubusco. Van Buren served in the war despite the fact that his father was opposed to the conflict. During the war, Van Buren also served as an aide to Generals Zachary Taylor and Winfield Scott and became an original member of the Aztec Club of 1847.
Later career
In 1848, Van Buren's family moved to New York City. In June 1854, Van Buren retired from the military. After his military career ended, Van Buren spent his remaining years editing and publishing his father's presidential papers and served as the leading apologist for his father's oft-criticized United States Presidential legacy.
Personal life
In 1838, Dolley Madison, widow of former President James Madison, introduced Van Buren to her cousin, Angelica Singleton, at a White House dinner hosted by his father. Singleton was a daughter of a wealthy South Carolina planter, and a refined lady who had been schooled in the fine arts at Madame Grelaud's French School in Philadelphia. Van Buren fell in love with her and the two were married at Colonel Richard Singleton's Wedgefield, South Carolina, plantation named "Home Place". The President was unable to attend the couple's wedding; however, he was delighted with the match. The two honeymooned in London. Upon returning to the United States, Angelica assumed the duties of "White House Hostess" because her mother-in-law had died after only twelve years of marriage in 1819. Their first-born, Rebecca, was born in March 1840; however, she died in the White House only months later. The couple later had three more children.
