Prior to 1885, restrictions on immigration were imposed mostly in response to large waves of immigration rather than planned policy decisions, but not specifically targeted at one group or ethnicity, at least as official policy.
1885年以前，限制移民主要是为了应对大股的移民潮而不是有计划的政治决策，并且至少在官方政策里没有专门针对某个群体或者民族。