Who came to America between 1600-1700? Under what category do they fall?
The English Puritans, the English Cavaliers, the English Nonconformists, and the Scots. They were all WASP (white anglo saxon protestant).
The coming of the (5) Irish, partly due to the Great Famine hitting Ireland in 1845.
American Civil War
Under what category do those who immigrate to US between 1600-1845 fall?
British islanders & English-speaking people
The "New Immigration"
The coming of the (6) Continental Europeans (greatest of all in number): Italians, Poles, Greeks, Slavs, Hungarians, and many other. These people were fleeing the centralization of Europe and the rise of modern nations there.
From 1865 onward
After Civil War, we witness the advent of non-British islanders and non-English speakers in a great number to the US.