Extra discussion: https://www.reddit.com/r/MapPorn/comments/5q433o/percentage_... I am really curious about a more thourough breakdown of these numbers. I doubt immigrants would have the same interest in war as the natives.
Likewise the Free French Forces (i.e. French military who refused to surrender in 1940) operating under British command were at least two-third colonials and/or immigrants.
[1] http://www.thedailybeast.com/the-real-story-of-the-french-re...