Though immigration had been a familiar aspect of American develo

Though immigration had been a familiar aspect of American development throughout the colonial period, the largest immigration movement did not take place until ______.
A、1890
B、1815
C、1847
D、1886
【正确答案】：B
【题目解析】：Though immigration had been a familiar aspect of American development throughout the colonial period, the largest immigration movement did not take place until 1815.参加教材P186。
掌握“Immigration(USA)”知识点。