Answer:
Colony
Step-by-step explanation:
France's extension of control over Vietnam through military force and imposition of a European-style government with French leaders in government positions is characteristic of a colony.
A colony is a territory that is governed by a foreign power, where the governing country exerts full political and economic control over the colony. The governing country may impose its own laws, institutions, culture, and language on the colony's population, and extract resources and wealth from the colony.
In the case of Vietnam, France used its military force to conquer Vietnam's territory and imposed a European-style government to rule the country, with French leaders occupying government positions. This meant that France had full political and economic control over Vietnam, making it a colony