Your answer would be The Mongols helped make the silk roads safer
A potentate had absolute power to make laws and command the army for 6 months.
Interstate commerce Act of 1887 designed to regulate the railroad.
In the United States, federal grants are economic aid issued by the United States government out of the general federal revenue. A federal grant is an award of financial assistance from a federal agency to a recipient to carry out a public purpose of support or stimulation authorized by a law of the United States.