People who come from a particular nation, or whose ancestors came from it, but who now live in many different parts of the world are sometimes referred to as thediaspora.
[formal]
...the history of peoples from the African diaspora.
...the Jews of the diaspora.
Diaspora in British English
(daɪˈæspərə)
noun
1.
a.
the dispersion of the Jews after the Babylonian and Roman conquests of Palestine
b.
the Jewish communities outside Israel
c.
the Jews living outside Israel
d.
the extent of Jewish settlement outside Israel
2.
(in the New Testament) the body of Christians living outside Palestine
3. (often not capital)
a dispersion or spreading, as of people originally belonging to one nation or having a common culture
4. Caribbean
the descendants of Sub-Saharan African peoples living anywhere in the Western hemisphere
Word origin
C19: from Greek: a scattering, from diaspeirein to disperse, from dia- + speirein to scatter, sow; see spore
Diaspora in American English
(daɪˈæspərə)
noun
1.
a.
the dispersion of the Jews after the Babylonian Exile
b.
the Jews thus dispersed
c.
the places where they settled
2. [d-]
any scattering of people with a common origin, background, beliefs, etc.
Word origin
Gr diaspora, a scattering < diasperein, to scatter < dia-, across + speirein, to sow: see spore
Examples of 'Diaspora' in a sentence
Diaspora
Most are recently returned or visiting diaspora Somalis.
Times, Sunday Times (2013)
Africans from the diaspora are returning, many with money and training to sink into opportunities that would not come their way in the West.