he wrote an anti-slavery newspaper
popular sovereignty
William wilberforce & Frederick Douglas
Both Frederick Douglas and William L. Garrison made substantial progress in having the US rethink their positions on slavery. Douglas and Garrison used their newspapers to inform Americans about the immorality of slavery. The also spoke in public concerning their ideas about the abolition of slavery in the US long before the US Civil War.
Stephan Douglas was against slavery.
Senator Douglas thought that a local vote - or 'popular sovereignty' - would be a better way of deciding for or against slavery in the new States.
It was Abraham Lincoln but Tubman and Douglas were against slavery too.
Slavery in the territories
Lincoln was anti-slavery and Douglas was pro-slavery. Both men were backed by business interests.
BOO
douglas argued for the right of states to decide whether or not to allow slavery
Henry Clay
....The Lincoln Douglas Debates