Corvins intended audience is the president of the United States. The reason he made this address to this president is because as president he had the powers to send troops to war.
Another reason is because the president could get popular vote from the senate on why the US should not go into war with Mexico.
The immediate consequences of the war would be the excessive loss of lives. Another consequence is the loss of resources or money in the war.
The internal commotion would be territorial issues and issues that had to do with slavery. He felt that when the US conquers the new territory, those moving into the new territories would do so with the slaves that they owned.
The point of collision would come up due to domestic arguments back home in the US. That is, if the area should be slave free, if it should be a slave territory or if slavery should be abolished all together. This might lead to civil unrest back in the United States
In summary Corwin was trying to send a message across to the president that going to this war was a bad idea for the US.
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