The Transcontinental Railroad impacted the economic development of the frontier in the late 19th century.
Promoted a production boom of the vast resources in the middle and western continent for use in production.
The arrival of masses of new residences led to changes in political boundaries closing the frontier.
The Homestead Act of 1862 impacted the economic development of the frontier in the late 19th century.
Provided federal land grants (160 acres) to settlers moving west into the Great Plains at no cost which decreased available land thus closing the frontier. *