What was the eastern boundary of the Thirteen Colonies?

The geographic feature that formed the eastern boundary of the thirteen American colonies was the Atlantic Ocean. That geographic feature still forms the eastern boundary of the continental United States. As boundaries go, the Atlantic Ocean is a very good boundary to have.

Explanation:

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adopted the practice of proskynesis, a persian court custom that involved bowing down and kissing the hand of others, depending on their rank.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.