colonialist:
(plural: ‘colonialists‘; pronunciation: the letter ‘c’ is said with a ‘k’ sound as in “king” — for the right pronunciation of this word, please click here)
a person, especially a European, who goes (went) in search of new lands, takes (took) control of a land and the people there, forms (formed) colonies and settles/lives (settled/lived) there permanently,

colonialists arriving
The British were the colonialist of N. America, Australia & India; the Spanish were the colonialist of S. America; and the other Europeans were the colonialist of some places in Asia and Africa.
The process of a colonialist going to a new land, occupying that place and settling there permanently is called ‘colonising’ and the entire system is called ‘colonialism’.
Some critics say that President Obama is against colonialists in Africa and may make policies that will effect the farms and businesses of the colonialist there.
