Right now, I would call them "diaspora" if they're more dispersed (Armenian diaspora is quite well-known) or a "community", for example "French community" if they're more closely in contact.
If they reject their new land's law and intend to include this land into their old one, they could be "colonizers".
The correct option is : Land
At the beginning of the 19th century Spain offered generous parcels of land in Las Floridas to attract settlers and they began to flow both from Spain and from the United States. The American settlers began attacking indigenous settlements that took their revenge by making incursions into US territory. The army of the United States began to cross the border with Spanish Florida to persecute the Seminoles.
Economic troubles, weak leader, and National Assembly