Answer:
The Magna Carta
Explanation:
This is the only event from the 13th century.
In the United States, "Growth of a slave power" as a cause of the war referred to "<span>the political power of those who supported slavery," since the Civil War was brought about almost entirely over the issue of slavery. </span>
Souther support for States right often because this actually help them from the government about to banning slave.