Answer:
Gadsden's Purchase provided the land necessary for a southern transcontinental railroad and attempted to resolve conflicts that lingered after the Mexican-American War .
It was his plan to re-admit Southern states into the Union
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That would be Burlington?
The Japanese attacked Pearl Harbor to weaken/neutralize the U.S. Pacific Navy in doing so it allowed for Japan to continue in its process in getting natural resources from Malaya and the Dutch East Indies. (oil, rubber)