This is a common question for people to ask, and the answers can only be speculative at best. One common idea rules that a person in their next incarnation will be thrown together with the people they were most emotionally attached to - either by love (including friendship) or by hate. This would be a good incentive for people to never actually hate anyone they don't like, so that fate would hopefully not throw them together again. So a person may in some instances be reborn in a country where the people they are closest to have ended up. As to whether this is by their own choosing, who can say. Note that there is no reason to suppose that with such a theory, these emotional chains would not also work with favourite pets, physical locations, nations, etc. We can also look at various examples for ideas. In one case, a man who claims to have been a German soldier in the First World War remembered in that lifetime seeing a poster advertising emigration to Canada and thinking that this could be a nice idea. He now lives in Canada, thereby giving some credence to the idea that one's own wishes may determine the place of rebirth.