Why did the lincoln-douglas debates and john brown's raid increase tensions between the north and south?

It is because both events highlighted division on slavery.

One of them was pro slavery and the other was no slavery

Aparagraph is a self-contained unit of a discourse in writing dealing with a particular point or idea. a paragraph consists of one or more sentences. though not required by the syntax of any language, paragraphs are usually an expected part of formal writing, used to orga

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.