What compromise does the dred scott decision nullify

Which of the following best describes us involvement in the korean peninsula today?

One drawback of voluntary trade is that it a.requires two groups to use a common language b.can make one group dependent upon another for necessary goods c.doesn't occur unless there is a shortage of goods for at least one group d.forces groups to rely on themselves to produce all the goods they need

The key idea of john locke’s enlightenment theory was to protect and enhance the freedoms and rights of