I've colonized africa in the majority of my games, I used to find it especially useful when playing smaller countries to boost my army size. However, it has bugged me how hard it is to sustain these colonial armies..the brigades loose their population quite quick and I end up with a bunch of unsupported brigades, besides using a national focus to retain the troops, is there any other way or is it just not sustainable as a source for soldier pops? More and more, I have stopped using colonial armies and only use my native pop.