North was most responsible for "killing" reconstruction.
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.
The land was free and perfect for farming, if settlers survived the journey to Oregon the land was all theirs. But not only did the US like it, Britain and Russia also liked it. So the US told people to move there ASAP so it would officially be claimed by America.
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