<span>After the Civil War, immigrants again began to stream to the United States. Between 1870 and 1900, nearly 12 million immigrants arrived--more foreign-born people than had come to the country in the preceding 70 years. During the 1870s and 1880s, the majority came from Germany, Ireland, and England--the principal source of immigration before the Civil War. Even so, a relatively large group of Chinese immigrated to the United States between the start of the California gold rush in 1849 and 1882, when federal law stopped their immigration.</span>
I think the answer your looking for is “blitzkrieg”
