Which of the following describes a major consequence of the ideas William H. Seward promotes in the passage from A History of Lawrence, Kansas?

A. The Kansas territorial government closed off the state from trade
and interaction with the United States.

B. Abolitionists succeeded in banning slavery in Kansas despite its
extensive popular support.

C. The Supreme Court was forced to intervene in Kansas to reaffirm
the constitutionality of slavery.

D. Supporters and opponents of slavery engaged in widespread
violence to influence Kansas's political future.