The pus collection causes pressure on the spinal cord. The infection is usually due to bacteria. Often it is caused by a staphylococcus infection that spreads through the spine. It may be caused by tuberculosis in some areas of the world, but it is not as common today as it was in the past.
From the 1830s until 1870, the abolitionist movement attempted to achieve immediate emancipation of all slaves and the ending of racial segregation and discrimination.
As the century progressed, branches of the abolitionist movement became more radical, calling for the immediate end of slavery. Public opinion varied widely, and different branches of the movement disagreed on how to achieve their aims.