The conclusion that can be drawn from the table is:
C) The expansion of the United States increased sectional tensions between the states.
The admission of both free and slave-holding states as new territories became part of the U.S. caused increased tensions between the North (free states) and the South (slave-holding states) over the issue of slavery, particularly as new states were added to the union. This dynamic is reflective of the broader conflicts that would characterize the lead-up to the American Civil War.