The petition was granted and Downingtown was created as a Borough in 1859. Though greatly opposed by the residents of East Caln, Downingtown petitioned to withdraw from the Township. It was used by troops to West Pennsylvania to put down the whiskey rebellion, groups of people heading west with covered wagons, sites for political speeches, and men going off to war. Not only did trade grow as a result of the roadway, but it made East Caln a witness to everything the happened in America.

The turnpike called easy trade with Philadelphia, Lancaster and points west. Development was greatly aided in East Caln by the construction of the Lancaster Turnpike, which opened in the last decade of the 18th century. People settled along rivers for the fertile soil and the use of water power for first and fulling mills, as well as saw mills. During the 18th century, development filled the same pattern as in other townships in Chester County.

East Caln originated in 1728 when the inhabitants of Caln Township petitioned to divide the town into East and West.

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