Until about 1840 America received no more than about 20,000 immigrants a year, mostly from two places: Africa in the form of slaves and the British Isles. Total immigration between 1607 and 1840 was no more than one million. Then suddenly, thanks to a famine in Ireland in 1845 and immense political upheaval elsewhere, America’s immigration became a flood. In the second half of the nineteenth century, thirty million people poured into the country, and the pace quickened further in the early years of the twentieth century. In just four years at its peak, between 1901 and 1905, America absorbed a
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