What territories that were acquired by the United States helped bring about the need for compromises dealing with slavery?

The low and midlevel clouds that look like cotton balls are

Me and youin the summer of 1804, after meeting native americans for the first time, lewis and clark reached the eastern edge of

    which of the following was anecological  result of european exploration from 1400 to 1800?   a.  increased trade with east asia      b.  the spread of epidemic diseases      c.  expansion of english territory      d.  the spread of christianity