Say something about the three immigration waves.
正确答案:
—— The first immigration wave began in the mid 1810s, grew steadily during the 1830s and 40s and reached the highest point in 1845. The second wave covered the period between 1860 and 1890. The third wave was the largest of the three. It happened between 1890 and 1914.
答案解析:有
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