Slaves were blocked from bringing lawsuits in courts because they weren't citizens.
Americans feared that their jobs would be taken by immigrants who were willing to be paid less for the same job.
Bleeding Kansas
States passed slave codes and slave laws. These laws kept the slaves in a subordinate position and made it so even a free slave could be captured and sent back into slavery.
They became more rigid as fear of slave resistance grew.
The United States qualifies as such.
california
Texas and Mexican territory become part of the United States.
(Apex) teehee.