Many great European powers had been exploiting China's weak economic system to enforce their own trade regulations for years. The United States simply wanted to join the fray, so the Open Door notes were sent to the European powers basically stating, "Hey, you guys can't own all of China, make sure that all countries get to trade equally with them."
Just as a side note, the Open Door policy with China was extremely hypocritical for the United States, as the Monroe Doctrine of 1823 basically stated that none of the European powers could interfere with the Western Hemisphere... While no one was allowed to touch the Americas, the United States was apparently allowed to mess with the rest of the world.
<span>
In many effects, the stuff that happened years prior to the Civil War.
Attempts to compromise, or find resolve in the conflict between Slave
and Free States. Such compromises as the Missouri compromise, and the
compromise of 1850. Both in each case, ending in a total wreck and
creating vastly more tension then before.</span>
