When did West Virginia join the United States?

West Virginia became a state on June 20, 1863. This date is significant as it marks the moment when West Virginia was officially admitted to the Union during the Civil War. The state was formed from the northwestern region of Virginia after a series of events that included local discontent with the Confederate government's actions and the desire for a separate identity and governance. In the wake of Virginia's secession from the Union in 1861, the western counties took steps to create their own government, leading to the creation of West Virginia as a separate state.

The designation of June 20, 1863, as the date of statehood is also celebrated annually as West Virginia Day, emphasizing its unique path to statehood and its role in the larger context of the Civil War. While other dates provided in the options might have historical significance, they do not mark the official admission of West Virginia to the United States.