How does a bill become a law at the federal level?

A bill can be introduced in either chamber of Congress by a senator or representative who sponsors it. The president can approve the bill and sign it into law or not approve (veto) a bill. If the president chooses to veto a bill, in most cases Congress can vote to override that veto and the bill becomes a law.

Explanation:

some american cities felt workers were being oppressed by business monopolies

interest groups send representatives to state capitals and to washington, d.c. to put pressure on members of congress and other policymakers. they engage in lobbying, or the organized process of influencing legislation or policy. lobbying can take many forms. interest groups can testify in congressional hearings.