So, no responses so far. It is very interesting for me, how different the world would be without such precautions, and is it possible at all – which metrics would serve as "suspicion" instead of color of your passport?<p>I think it is possible actually, but the world would be much less "sharing", and social care would be developed much less (like in USA some time ago, where you basically had to survive all by yourself).<p>As a russian, I've encountered this few times, that countries are not very happy to invite me – I have to apply for UK visa ~6 months in advance with full itinerary, and same for few other countries with strict rules. Other are easier, but still, for the "developed" world, I am at the level of some refugee. Yeah, I know, I can have 5 previous successfull visas, have few millions saved in my homeland, but as a young person, it is pretty hard – and is true discrimanation; but I understand it's roots completely and don't complain about it, it just makes me laugh how different one's possibilities could be based on random things.