Slavery was abolished in 1834; the resulting labor shortages on the plantations attracted Portuguese immigrants in the 1840s and east Indians in the 1860s. Conditions remained harsh for both former slaves and immigrant agricultural workers, as depressed world sugar prices kept the economy stagnant until the turn of the century.

From 1763 until independence, St. Vincent passed through various stages of colonial status under the British. A representative assembly was authorized in 1776, Crown Colony government installed in 1877, a legislative council created in 1925, and universal adult suffrage granted in 1951.

During this period, the British made several unsuccessful attempts to affiliate St. Vincent with other Windward Islands in order to govern the region through a unified administration. The most notable was the West Indies Federation, which collapsed in 1962. St. Vincent was granted associate statehood status in 1969, giving it complete control over its internal affairs. Following a referendum in 1979, St. Vincent and the Grenadines became the last of the Windward Islands to gain independence. Natural disasters have plagued the country throughout the 20th century.

In 1902, La Soufriere volcano erupted, killing 2,000 people. Much farmland was damaged, and the economy deteriorated. In April 1979, La Soufriere erupted again. Although no one was killed, thousands had to be evacuated, and there was extensive agricultural damage. In 1980 and 1987, hurricanes devastated banana and coconut plantations; 1998 and 1999 also saw very active hurricane seasons, with hurricane Lenny in 1999 causing extensive damage to the west coast of the island.