Although much of the migration of settlers in the American Colonies and later the United States moved from east to west, from New England to New York and New Jersey and on westward, there were some who migrated into New England from New York and New Jersey. My wife's fifth great-grandfather, Jeremiah Brower (Brewer), who was born in New Jersey, was one of the first settlers at Highgate, Vermont in the mid-1780s. Nicholas Birdsall Brower (1772-1838) lived for a time at Westport, Connecticut. Henry Brower, born in 1806 at Paterson, New Jersey, moved his family to Charlestown, Massachusetts. In fact, a handful of Dutch families are found in the Connecticut River Valley during the 17th century. Stoffel Van Sant, baptized in 1701 at Staten Island, settled at Hartford, Connecticut. His daughter Anne had an illegitimate son by Daniel Brewer, a descendant of one of the New England Brewer families. These are just a few. There were others.
Here are a few sources that I have used when conducting research in New England.
The Public Records of the Colony of Connecticut Prior to the Union with the New Haven Colony
Records of the Particular Court of Connecticut 1639-1663
Some Connecticut Records online
The Ancient Burying Ground of Hartford, Connecticut
Research Guide to Probate Records at the Connecticut State Library
Research Guide to Connecticut Probate Districts
New Hampshire State Papers
New Hampshire State Papers Index
Gateway to Vermont
Vermont Historical Society
Vermont Biographies Project
NorthEast Kingdom Genealogy
Genealogical Society of Vermont
Vermont Office of the Secretary of State - Vital Records
And of course there is AmericanAncestors.org, the website of the New England Historic and Genealogical Society which was founded in 1845. Access to most of the databases and resources onn this site requires a membership. In the past it has been a given that if you intend to do any serious research in New England, a membership to the NEHGS is a must. But now the NEHGS is quickly becoming the website to go to for research in New York as well. I'll have more on this in a future post.