In 1923, the National Flag Conference called for the words "my Flag" to be changed to "the Flag of the United States," so that new immigrants would not confuse loyalties between their birth countries and the US.
The answer to this question is:
~Europeans had no interest in or concern for African cultural divisions.
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From the point of vies of this place (i.e. for the people who stayed in the place) this is called emigration: when people leave the country, it's called a mass emigration.
From the point of view of the place where this person settles down, this is called immigration and this person is an immigrant