The policy is known as the "Open Door Policy."
John Hay created this idea in hopes that America and countries all over Europe could trade peacefully with China. This concept was developed in order to protect America's trade interests while also ensuring that no other country would establish a monopoly on trade with China. Within this policy, all countries would agree not to interfere with another country's trade with China.
The <em>nullification crisis was a crisis between South and North America.</em> It happened during the presidency of Andrew Jackson and it consisted of the Ordinance of Nullification that made possible to the state of South Carolina to nullify federal laws that were passed by the United States Congress.
Henry Clay was a congressman and during that time he made the proposal for the Compromise of 1850. This compromise <em>was a package of laws</em> that were passed by the Congress, it <em>created New Mexico and Utah, admitted California as a free state, made Texas loose territory for New Mexico state, ended Washington DC slave trade and made easier to slave owners to recover slaves that ran away</em>. Basically, this Compromise tried to cool things down and actually delayed civil war.