Which process allows for citizens to change an existing law?

In the politics of the United States, the process of initiatives and referendums allow citizens of many U.S. states to place new legislation on a popular ballot, or to place legislation that has recently been passed by a legislature on a ballot for a popular vote.

Explanation:

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.