Arthur’s eldest son Henry inherited Middleton Place at the age of 17, apparently while he was still in school in England. Henry devoted a great deal of attention to the gardens planted by his grandfather, enlarging them and introducing many new plants, some of them newly brought to America by the French botanist André Michaux. From 1801 to 1830 Henry was continuously in public office, first as a South Carolina legislator and governor, then as a member of the United States Congress, and from 1820 to 1830 as American ambassador to Russia.
By the time he returned from his service abroad, South Carolinians had embarked upon the separatist agitation that would eventually lead to their third attempt in 150 years to overthrow a government.
At issue were the 1828 and 1832 “tariffs of abomination,” designed by Congress to protect fledgling industries in the northern states. However, they were viewed by indignant Carolina planters, dependent on direct trade with England, as an assault on their agricultural economy. The South Carolina Nullification Convention of 1832 declared the tariff null and void on the basis of John C. Calhoun’s doctrine that a state had a right to vote to disregard onerous acts of Congress and, if other states found its action unacceptable, to secede. As a member of the opposing Union Party, Henry Middleton was perhaps the first of his family to take an active conservative role in a dispute pitting South Carolina against an outside governing body.
This early threat to the Union was deflected with a tariff reduction in 1833, but the nullification doctrine had laid the ideological groundwork on which 11 southern states were to base their secession over the issue of slavery 28 years later. Slavery was an economic mainstay of agriculture throughout the South, but particularly so in South Carolina, where slaves had been imported from Barbados with the very earliest settlers at Charles Town and where a plantation system based on involuntary servitude had existed since the late seventeenth century. By the early 1700s African slaves already made up three-quarters of the South Carolina population, and on the eve of the Civil War, South Carolina remained the largest slaveholding state in the Union. Colleton District, where Middleton Place was located, was nearly 80% black.