Answer:
because they were the first country to declare war before any other country.
Explanation:
Rival groups, both pro and anti-slavery, attempted to gain political control of the territory and recruited immigrants to move to Kansas.
Explanation:
Stephen Douglas legally proposed that the state Missouri can be divided into two distinct territories. He had proposed the separation of Missouri in order to start a transcontinental railroad project that would benefit the people of his constituency, Illinois. He desired to rescind the Missouri compromise and proposed the partition of the state. The option of forming as a free or a slave state was left as per the choice of the individuals in the territory.
This separation of Missouri was not welcomed by the protesters of slavery because as per the Missouri compromise slavery was not allowed in both new territories. Both the supporters and protesters of slavery sought to gain governmental control of the territory and made many immigrants to move to Kansas. When the law came into effect, both the supporters were involved in a brutal conflict and turned aggressive and this made many new settlers to lose their life in Kansas.
Are you asking for some examples of challenging the color barriers? if so then some examples are the Little Rock Nine trying to desegregate schools, and the Greensboro Four who sat at a counter in a diner marked only for whites and they were harassed but they were always polite.