Kingdom of Vientiane
The term Laotian is wide, as it either refers to the people born in Laos and its many ethnicities [49 recognized by Laos] (the Hmong people per example) or, the real term for the majority Lao Loum (constituting 69% of the country) that is simply Lao. The “S” in Laos is actually silent, it was added as the plural of Lao during the French unification of the many Lao states in 1947 to form the Kingdom of Laos (unified from the Kingdom of Luang Phrabang, the Kingdom of Vientiane, the Kingdom of Champassak and the principality of Muan Phuang. All were previously ruled by Siam, and before that were part of the first Lao Kingdom of Lan Xang.)