Which sentence of the text highlights the Southern states’ beliefs on the value of slavery: In the decades leading up to the 1860s, several arguments arose about the rights of individual states versus the national government. One of these arguments was about states' rights, with appeals for and against slavery at its core. Southern states did not want to give up their perceived right to enslave people for economic purposes. Northern states demanded that slavery be abolished and that newly admitted states to the Union would be free states. The North’s position was viewed by the South as an attempt to weaken their political and economic power as well as their general way of life. This fear eventually led to the Southern states seceding from the Union and the start of one of the most momentous events in U. S. history—the Civil War.

The sentence that highlights the beliefs of the Southern states is the "Southern states did not want to give up their perceived right to enslave people for economic purposes."

The tensions that eventually led to the civil war in the United States had been building for some time.  

To know more about the  Southern states’ beliefs on the value of slavery, refer to the link below:

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The sentence that highlights the beliefs of the Southern states is the "Southern states did not want to give up their perceived right to enslave people for economic purposes."

Explanation:

The tensions that eventually led to the civil war in the United States had been building for some time.  For example, the states of South Carolina and Mississippi had been calling for secession since 1850.  Agriculturalists in the Southern states felt their success was dependent on the continuation of the slavery system that helped to support the production of agricultural goods like cotton. The Northern states were more industrial in nature and they relied more heavily on cheaper immigrant labor and thus there was a tension over which sort of labor system would perpetuate.  As new states were being admitted to the Union with the expansion westward there was tension between the North and South and the balance of power between them.  

you answered your own : -/