The us population grew during the gilded age mainly because of

The United States has been the majority destination for European immigrants. Thus, between 1815 and 1860 five million people from Europe arrived in that country, and another 27 million entered between 1860 and 1920. Between 1840 and 1920 six million Germans immigrated, 4.75 million Irish, 4.5 million of Italians, 4.2 million English, Welsh and Scots, 4.2 million from the Austro-Hungarian Empire, 2.3 million from Scandinavia and 2.3 million from the Russian Empire (particularly Catholic, Polish and Jewish Lithuanians). 8 million Europeans arrived in 1890, about nine million between 1905 and 1914. In 1907, one million two hundred thousand immigrants entered, the largest annual income. Between 1874 and 1888, 5,881,000 immigrants arrived and between 1904 and 1935 16,878,000. Nearly 370,000 Swedes, Danes and Norwegians emigrated to the United States between 1850 and 1875.30

At the beginning of the 20th century, New York had the third German-speaking community worldwide after Berlin and Vienna.

everyone shares everything

early human migrations are the earliest migrations and expansions of archaic and modern humans across continents and are believed to have begun approximately 2 million years ago with the out of africa migration of homo erectus. this initial migration was followed by other archaic humans including h. heidelbergensis, which lived around 500,000 years ago and was the likely ancestor of both denisovans and neanderthals. early hominids were said to have "crossed land bridges that were eventually covered in water" .

within africa, homo sapiens dispersed around the time of its speciation, roughly 300,000 years ago.the "recent african origin" paradigm suggests that the anatomically modern humans outside of africa descend from a population of homo sapiens migrating from east africa roughly 70,000 years ago and spreading along the southern coast of asia and to oceania before 50,000 years ago. modern humans spread across europe about 40,000 years ago.

the migrating modern human populations are known to have interbred with local varieties of archaic humans, so that contemporary human populations are descended in small part (below 10% contribution) from regional varieties of archaic humans.

after the last glacial maximum, north eurasian populations migrated to the americas about 20,000 years ago. northern eurasia was peopled after 12,000 years ago, in the beginning holocene. arctic canada and greenland were reached by the paleo-eskimo expansion around 4,000 years ago. finally, polynesia was peopled after 2,000 years ago, by the austronesian expansion.