Moral arguments by leading religious leaders over slavery in both the north and the south made compromise on the subject nearly

impossible

Explanation:

According to my research on the civil war in the United States, I can say that based on the information provided within the question these moral arguments by religious leaders made compromise on the subject nearly impossible. This is because in that time period (as well as today to some extent) the Church had immense power, so regardless whether their views on slavery were correct or not their opinion was met with a lot of support. Which the opposing side could not compromise with.

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  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.