Once upon a time when you wanted to invade another people's land, you built your longboats, got together some young males with few prospects at home and set sail for greener pastures. Today the longboats are jet planes and the invaded use them to ferry over their own invaders. Colonization usually required three elements. Surplus male population, the technology to make the journey and the means to subjugate or drive off the people already living there. » If you like this article, please subscribe to our daily newsletter Nina_Pinta_SantaMariaWestern medicine and aid have helped create and sustain a surplus population...