The most powerful democratic political machine in new york was ?

tWilliam Magear Tweed (April 3, 1823 – April 12, 1878) – often erroneously referred to as "William Marcy Tweed" (see below), and widely known as "Boss" Tweed – was an American politician most notable for being the "boss" of Tammany Hall, the Democratic Party political machine that played a major role in the politics of ...

Explanation:

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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pennsylvania, new hampshire, massachusetts, connecticut and rhode island .