Colonisation or colonial exploration of North America,South America,Australia,Africa,etc...,
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In History, Belgium has a variety of languages like French, Dutch, and Germany. But the people's were forced to speak Only French.

Another example, Srilanka had a variety of  linguists like Sinhalas(74%) , Tamils(18%).
But the peoples were forced to stop speaking Tamil and only speak Sinhala...

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