When Harriet Beecher Stowe wrote Uncle Tom's Cabin how long did it take? Explain how important Uncle Tom's Cabin was to America's history. Please no links!

1851-1852

Explanation:

Uncle Tom's Cabin was important to history because it was one of the major books to have a main black character. It helped set the political standard for anti-slavery which would become apparent in the election of 1860.  The novel shared injustices of slavery and showed resistantce to decades of negative cultural beliefs surrounding black people.

from the conditions of the working class in england by friedrich engels,the main idea is :

the northwest ordinance of 1787 guaranteed basic rights for settlers and banned slavery there.