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Explanation: Part of President Johnson's plan for Reconstruction was to make sure that no ex-Confederate Generals of wealthy planters from the South would be able to serve in Congress. Did this page answer your question?
Because I am not exactly sure what war you are talking about, I will answer the question as if it were World War II. The Attack on Pearl Harbor is the main reason the U.S. joined the war (WWII).
I hope this helps.
It was a. Charles Sumner who opposed the Dred Scott decision. He did this mainly on the grounds that he believed blacks had basic rights when it came to shin for their freedom in free states, which was the case for Scott.