Which idea in this excerpt uses fallacious reasoning? slaves and slaveowners, in general, are different "by color, and other physical differences." conflicts between labor (workers) and capital (business owners) are common in many civilizations. unity, or "concert," would strengthen the slave-owning states of the south to better defend themselves against changes to the law that would compromise their lifestyle. the relationship between slave and slaveowner is "the most solid and durable foundation on which to rear free and stable political institutions."