What law passed by congress in the first two decades of the nineteenth century upheld slavery?

The reason that the U.S. government began passing the anti-trust laws in the late nineteenth century are because of the following;

-          There is an emergence in separation of laws and policies

-          Financial concerns were evident in companies

-          Consolidation of giant systems due to small short line railroads.

it is the code of hammurabi

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes