| Introduction | Historical Background | Chronology | Geography | Biography | Technology | Ownership and Financing | General Bibliography |
| Middle Atlantic States | District of Columbia |
The District of Columbia was formed in 1790 as a seat for the new federal government.
United States Statutes at Large
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| Note: The second column in the chronological table above shows the order in which systems were built in the state. Where no number is shown, a company was formed but no evidence has been found that the system was constructed. | |||||||||||||||||
© 2015 Morris A. Pierce