The Irish potato famine led to the influx of huge numbers of Irish immigrants into the US.
St. Patrick's day began in New York, when the first large immigrant group of Irishmen came from Ireland in 1846 after the potato famine.
The largest immigrant group in the US are Mexicans, of which about 800,000 Mexicans migrate to the US every year.
Mexicans
The Turkish are the largest immigrant group to Germany.
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Hispanics
A potato is a root vegetable, not a grain.
the Chinese
Chinese
Latinos
The Chinese
Irish