The change of ethnic composition was connected with flexible immigrant policies, increasing Asian and Latin immigrants , and different ethnic birthrates.

• 这种族群结构的变化,与美国移民政策的松动、亚裔拉美裔的合法移民和非法移民的大量涌入,有着密不可分的关系; 各族群生育率的差异在一定程度上也影响了美国族群结构的变化。