The reason why Harriet Beecher Stowe published her book is to show and highlight the evilness inside of slavery and how it is effecting lives. In doing this, she actually angered the Southern-Slave holders and they ended up inspiring the slave trade even more than before.
Hope this helps you!
The south wanted to keep the slavery, while the north didn't.... P.S buffalo soldiers fought in the civil war and the spanish american war, buffalo soldiers were the first African american group to fight in a war