query: What's the Siouan language?
passage: Siouan languages
Siouan or Siouan–Catawban is a language family of North America that is located primarily in the Great Plains, Ohio and Mississippi valleys and southeastern North America with a few other languages in the east.
passage: French language
French was the official language of the colony of French Indochina, comprising modern-day Vietnam, Laos, and Cambodia. It continues to be an administrative language in Laos and Cambodia, although its influence has waned in recent years. In colonial Vietnam, the elites primarily spoke French, while many servants who worked in French households spoke a French pidgin known as "Tây Bồi" (now extinct). After French rule ended, South Vietnam continued to use French in administration, education, and trade. Since the Fall of Saigon and the opening of a unified Vietnam's economy, French has gradually been effectively displaced as the main foreign language of choice by English. French nevertheless maintains its colonial legacy by being spoken as a second language by the elderly and elite populations and is presently being revived in higher education and continues to be a diplomatic language in Vietnam. All three countries are official members of the OIF.