What contributed to the events of “bleeding kansas”?

the blistering speech of charles sumner on the senate floor

the competition between farmers trying to settle the land

the competition of opposing political groups

the attack on sumner by preston brook

What contributed to the events of "Bleeding Kansas" was the competition of opposing political groups, regarding the issue of slavery.

It encompasses a series of violent political and popular confrontations between 1854 and 1861, in the Kansas Territory and the western border towns of Missouri, between anti-slavery "Free Staters" and "Border Ruffians", supporters of slavery.

The events of Bleeding Kansas led directly to the American Civil War and conditioned relations between Kansas and Missouri.

it increase by 12% a year from 1812-1820