Old Stock Americans

Old Stock Americans, Pioneer Stock, or Anglo-Americans, are Americans who are descended from the original settlers of the Thirteen Colonies of mostly British ancestry who emigrated to North America in the 17th and the 18th centuries.
Settlement in the colonies.
Between 1700 and 1775, the overwhelming majority of immigrants to the colonies (around 75%) were Britons of varying ethnic backgrounds such as English, Scottish, Welsh, and Ulster-Scots with initial settlements focused on the colonial hearths of Virginia, New England and Bermuda under Elizabeth I, James VI and I and Charles I. Populations of Huguenots, Dutch, Swedes, and Germans arrived before 1776 mostly as fellow royal subjects, but the majority were from Great Britain (having been influenced by republican ideals during the Commonwealth of England and the Protectorate). By 1776 there were between 2 and 2.5 million colonists in the Thirteen Colonies.
19th Century to present.
Until the second half of the 20th century, Old Stock Americans dominated American culture and politics. Thousands of Germans and Irish from the southern regions of their countries immigrated to the United States during the 19th century and were met with strong opposition from the majority Protestant and temperance movement-minded Old Stock, who were anti-immigration and anti-Catholic. 
Regardless of ancestral origin, English-speaking, native-born white Americans, were referred to as "Anglos" or "Native Americans" (not to be confused with indigenous Americans). US settlers arriving in droves to the newly acquired, formerly French Louisiana, Spanish Florida, and Mexican colonies (California, Texas, and New Mexico with Arizona), whether they were native born or of European origin, were labelled as "Anglos”.