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In page Thomas Paine:

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In 1787, Paine proposed an iron bridge design for crossing the Schuylkill River at Philadelphia. Having little success in acquiring funding, Paine returned to Paris, France seeking investors or other opportunities to implement his, at the time, novel iron bridge design.[citation needed] Because Paine had few friends when arriving in France aside from Lafayette and Jefferson, he continued to correspond heavily with Benjamin Franklin, a long time friend and mentor. Franklin provided letters of introduction for Paine to use to gain associates and contacts in France.[7]