Final answer:
Proslavery supporters in Kansas c. used fraudulent means to establish a proslavery majority in the territorial government by casting illegal ballots in the Kansas elections.
Step-by-step explanation:
In the early struggle to win Kansas, proslavery supporters c. used fraudulent means to establish a proslavery majority in the territorial government.
Proslavery leaders, led by David Atchison and proslavery forces from Missouri, cast illegal ballots in the Kansas elections. This resulted in the proslavery legislature securing a majority in the territorial legislature, even though almost 5,000 illegal ballots were cast.
They also passed a series of laws to undermine the influence of the Free Soilers, including one that made it a crime to express antislavery statements.