Also grist for the mill of war. If you’re planning to annex Canada, or Mexico, or all of Latin America or whatever, you’ll need a lot of bodies. Desperate people are way more likely to say “holy shit the army’s recruiting for that war in Mexico. I don’t like it, but having 3 hots and a cot sounds pretty swell instead of fistfighting Ralph behind the Shoney’s for the last slice of pizza.”