Some southerners felt the ships would be used to protect the trade of New England, but do little for southern economies.
Some members of Congress thought a navy would be a foolish challenge to the world's mightiest navy.
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One reason that some Americans opposed the annexation of Texas was that they didn't want to go war with Mexico. Another reason was that it would change the balance between states that had slavery and those that didn't.
Some people opposed the Truman Doctrine because the plan ultimately ended up reversing the government's earlier decision not to get involved in European affairs. Many people wanted the U.S. to mind it's own business so as not to get involved in another war.
Because it could have allowed some new slave-states in the West.
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Numbers of Americans supported slavery, and some loathed slavery.