The main subject reported by abolitionist papers in the 1800s was the events of the second great awakening. the education of young african americans. the rise of the cotton industry in the south. the news about the antislavery movement.

The correct answer is
the news about the antislavery movement.

The abolitionist movement was primarily all about abolishing slavery and promoting various activities and organizations that could help achieve that, as well as lobby with the government to abolish slavery. The papers were used to convey their ideas.