ethnic cleansing didn't come into use until the 1980s.
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Although scholars do not agree on which events constitute ethnic cleansing,[7] many instances have occurred throughout history. The term was first used to describe Albanian nationalist treatment of the Kosovo Serbs in the 1980s,[9][10] and entered widespread use during the Yugoslav Wars in the 1990s. Since then, the term has gained widespread acceptance due to journalism.[11] Although research originally focused on deep-rooted animosities as an explanation for ethnic cleansing events, more recent studies depict ethnic cleansing as "a natural extension of the homogenizing tendencies of nation states" or emphasize security concerns and the effects of democratization, portraying ethnic tensions as a contributing factor. Research has also focused on the role of war as a causative or potentiating factor in ethnic cleansing. However, states in a similar strategic situation can have widely varying policies towards minority ethnic groups perceived as a security threat.[12]
Ethnic cleansing has no legal definition under international criminal law, but the methods by which it is carried out are considered crimes against humanity and may also fall under the Genocide Convention.[1][13][14]
https://en.wikipedia.org/wiki/Ethnic_cleansing
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