Which minerals and gems are commonly mined in the tropical north?
choose all answers that are correct.
a. diamonds
b. rubies
c. emeralds
d. bauxite

One argument of those who supported the gold standard system in the united states was that the gold standard

To what extent did mary lease's concepts of justice, freedom, and equality agree with those of samuel gompers and emilio aguinaldo? how did they compare with those of the pinkertons at homestead?

How and why did the policies of the federal and state governments toward native american people change between 1790 and the 1850s. what were the reaction of native american people to these policies?