This 1903 law strengthened the woefully weak interstate commerce act of 1887 by giving the interstate commerce commission the power to impose fines on railroads that gave rebates and on shippers who accepted them.

The correct answer is:

Elkins Act.

The Elkins Act (1903) is a United States federal law that improved the Interstate Commerce Act of 1887. It allowed the Interstate Commerce Commission (ICC) to inflict onerous fines on railroads that offered rebates, and as well on the shippers that took these rebates. The railroad companies were not permitted to offer rebates. This act made railroad corporations, their officers, and their employees all liable for discriminatory practices.

you didn't give any answers to choose from so i can't with this but, i do know something that the mexican government would be worried about and that is the wall that donald trump is currently trying to get up.

number 4. should be the correct answer