How did the Compromise of 1850 try to settle the issue of slavery in the new lands? What roles did Clay, Webster and Douglas play in this compromise?

The Compromise of 1850 dealt with the land the U.S. acquired
from Mexico in the Mexican-American War.  This land was known as the Mexican Cession.  This
compromise attempted to settle the issue of slavery in this new territory by trying to give each
side, pro-slavery and anti-slavery, something they could support. There were five parts to the
Compromise of 1850. First, California was admitted to the Union as a free state. Next, two new
territories were established, Utah and New Mexico, and slavery in those territories would be
determined by popular sovereignty, that is, the people of the territories would decide the issue.
The border of the state of Texas was determined, with Texas giving up some of its land in
exchange for $10 million.  The slave trade, but not slavery itself, was ended in the District of
Columbia.  Finally, a new, strict fugitive slave law was enacted.  This compromise was difficult
to get passed because each part of the compromise upset one part of the country.  California as a
free state upset the south.  Opening slavery to new territories upset the north. Ending the slave
trade in D.C. upset the south. Passing a new fugitive slave law upset the
north.

Henry Clay, Daniel Webster, and Stephen Douglas all played an
important role in the passage of the Compromise of 1850. Henry Clay, known as “The Great
Compromiser”, came up with the plan which he hoped would save the nation from being torn apart. 
The debate over this compromised raged for eight months, with John C. Calhoun leading the
opposition and threatening secession. Daniel Webster, one of the Senate’s great orators, threw
his support behind Clay and his compromise and gave a rousing speech in support which began, “Mr.
President, I wish to speak today not as a Massachusetts man, nor as Northern man, but as an
American ... I speak today for the preservation of the Union. Hear me for my cause."  He ended by
warning "there can be no such thing as a peaceable secession."  Stephen Douglas took a leadership
role in the fight for passage.  It was Douglas who coined the term “popular sovereignty” and it
was his idea to abandon Clay’s idea of putting the compromise in one bill. Instead, he introduced
each idea one at a time and was able to garner enough votes for each part
individually.