[DiogenesLamp]

the south was all for using the Federal Government to advance slavery into the territories.

Well, the US constitution made it virtually impossible to prohibit slavery from the territories, so I would suppose you mean that the South insisted that the US constitution apply to the territories too.

[BroJoeK]

DiogenesLamp: "the US constitution made it virtually impossible to prohibit slavery from the territories, so I would suppose you mean that the South insisted that the US constitution apply to the territories too. "

Only after the US Supreme Court's bizarre Dred-Scott decision in 1857.
Before that everyone understood that slavery was a matter for individual states themselves and for the US Congress to rule over territories.

Before Dred-Scott that was not even controversial.