Answer: Germans: More than 1.5 million between 1820 and 1860. The 1850s was the single biggest decade for German immigration, with some 951,000 reaching the United States. Why They Came Irish: Most emigrated to escape grinding poverty in Ireland—or to avoid outright starvation in the years of the potato famine.
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I'm pretty sure the answer is 2.
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By the start of World War II in 1939, the Luftwaffe was the strongest and best-trained air force in the world. They played a crucial role in Germany's methodical and highly effective invasion of much of Western Europe, including Poland, Holland, Belgium and France.
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