Beginning in 1607, the primary immigrants were British. The years of 1820 to 1830 saw a wave of Irish immigrants.
Primary social groups are the main groups to which people belong. A great example of a primary social group would be the family.
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Primary groups provide support and camaraderie, secondary groups offer specialized expertise, in-groups foster loyalty and cohesion, and out-groups may provide a contrasting perspective. Reference groups set standards for behavior and performance within the organization.
immigrants
Primarily Irish immigrants from the east cost of the US, and Chinese immigrants from the west. There were other ethnic groups who worked on the railroads, but these were the largest groups.
Immigrants travel from their respective countries to another country. Immigrants tend to travel in groups, or settle in areas with many people of their same ethnicity.
native americans even though we aren't immigrants !
Immigrants tended to settle in nationality groups
eugenics
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Between 1830 and 1860 the main groups of immigrants came from Europe. More specifically, the largest groups immigrating were people from Ireland and Germany.
A primary group has fact to face interactions and is more intimate than secondary groups. Secondary groups are more formal.