The pros of the Nile River are: it provided water for crops, gave a water source, and provided a food source. The cons were: over flooding, pollution, and caused destruction to homes and farm lands.
Lincoln went public with the preliminary Emancipation Proclamation, which called on all Confederate states to rejoin the Union within 100 days—by January 1, 1863—or their slaves would be declared “thenceforward, and forever free.
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Based on this passage and what you have learned about the states, the states were unwilling to voluntarily work together in a confederation because each state had its own interests and needs.
Each state was in favor of proceeding their own interests and needs they believed that focusing on their needs would be a much better option in the long run. Unity wasn’t a wide practice during that era too.