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Easy answer. In other countries they are predominantly one race. Example in China is 99 percent Chinese. In other countries you also cannot stay for more than a month they kick you out if your not a citizen. Only in the US is there a diverse group of cultures. So more room for disagreements. Also US is least racist place when it comes to living. You can't live in other parts of the world without citizenship. I have friends who live in Sweden and Denmark but they were going to get kicked out after one month. They were only allowed to stay because they became dual citizens. US is much nicer in this regard they allow you to get work visas and other things. So in many respects United States is the least racist place.