Why was the cotton gin considered an important invention?

How do conflict minerals, and in particular, conflict coltan get their name? what groups benefited from the trade in conflict minerals? what group were hurt by it?

He electoral vote is tied between two presidential candidates. what happens next? the house votes to determine who wins the presidency. the senate votes to determine who wins the presidency. the presidency is decided by the supreme court. the presidency is decided by the popular vote.

What development led the soviet union to establish the warsaw pact? the soviets gained control over satellite countries. west germany joined nato. the allied powers grew weaker. the berlin wall was erected between east and west germ