How did empires relate to nation-states? They were stand-alone entities that staved off empires. They emerged when feudal lords and the Catholic Church could no longer hold power. They sought political change through the elections. They broke away when Empires began to grow weak.

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.