It regulated European colonization , and trade in Africa <span />
Fascism in general is characterised by a purist ideology (i.e., the ideology that a 'pure' national race is to be maintained within a country and that other races are to be eliminated). American fascism was no exception: it mainly promoted the rights of white Americans - which is thus a group they did not attack. For this reason American fascists are sometimes called "white supremacists".
The British settlers brought new diseases that the native groups weren't used to yet, so many native people died.