United States might not be able to save its ally, South Vietnam, from its communist aggressors.
Answer:Japanese (日本語, Nihongo [ɲihoŋɡo] ( listen)) is an East Asian language spoken by about 128 million people, primarily in Japan, where it is the national language. It is a member of the Japonic (or Japanese-Ryukyuan) language family, and its ultimate derivation and relation to other languages is unclear.
Explanation:
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They settled in river valleys because they wanted their crops and soil to be rich and eaiser to water their plants.
