Which words would the author use to describe the Democratic platform of 1860 as described in the passage?

The passage states, “These resolutions, demanding in effect that slavery be thus safeguarded — almost to the extent of introducing it into the free states — really foreshadowed the Democratic platform of 1860 which led to the great split in that party, the victory of the Republicans under Lincoln, the subsequent secession of the more radical southern states, and finally the Civil War, for it was inevitable that the North, when once aroused, would bitterly resent such pro-slavery demands.” Thus, the platform was divisive because it split the party and it was impactful because it was a catalyst for the Civil War.