In the 19th century, human rights became a central concern over the issue of slavery.

The state Democratic party had been going though a period of internal problems over the slavery issue.

The party was also torn on the issue of slavery.

The new party went well beyond the issue of slavery in the territories.

The eastern half of the state saw much debate over the slavery issue.

The slavery issue came to a head with the Compromise of 1850.

Such appears to be true on the issue of "slavery" at least.

During this time, the country was on the brink of war over the slavery issue.

Democrats stake out a clear moral position only on the issue of slavery.

However, the population was deeply divided over the issue of slavery.