The New England Confederation reference article from the English Wikipedia on 24-Apr-2004
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New England Confederation

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The New England Confederation came together in 1643 to discourage attacks from other colonies such as the Dutch in nearby New Netherlands, and American Indians. Named the United Colonies of New England, it was formed by New Haven, Massachusetts, Connecticut, and Plymouth. Rhode Island and other New England colonies were excluded on religious and political grounds. The confederation disintegrated in the 1650s after Massachusetts refused to join the war against the Dutch during the First Anglo-Dutch War.

New England Confederation
Mercator projection: New England Confederation in yellow