Final answer:
Slavery contributed to the shape of Oklahoma by extending slave-holding states to its southern border, concentrating slavery in its southern portions, and leading to the establishment of new towns in its western border.
Step-by-step explanation:
Slavery contributed to the shape of Oklahoma in several ways. Firstly, slave-holding states extended to the 37 longitudinal line, which is the southern border of present-day Oklahoma. Secondly, slavery was primarily concentrated in the southern portions of the United States, which included Oklahoma. Lastly, the expansion of plantation slavery in the West, driven by the growth of the cotton kingdom, led to the establishment of new towns in the western border of Oklahoma.