我觉得,新兴国家比如美国,本身就是由多民族多国家的人民组成的,凝聚了最优秀的人才,加上广袤土地和丰富资源,所以才快速发展 i personally feel that the new country such as USA , was consisted by different people from different nations , plus the huge land and numerous resources , that's why USA can develop such fast