At times, it was chaotic because it was so much land to control that the ruler split it into "states", and gave each one to a family member. But, after a while they realized some of the family had more land than others, so they began to fight. The bigger lands conquered the others with their stronger army.
We went back to "Undisturbed Isolationism". We cut ourselves off diplomatically for the most part from many European powers out of fear of being brought into another World War. America was completely and only about America.
The answer in apex is "the battle of San Juan Hill"
In George Washington's words "A pasionate attachment of one nation for another produces a variety of evils".
With this statement, as well as a many others in his famous Farewell Address, what Washington was mainly trying to warn the American people about is that becoming fanatical of any political party or overly-obsessive about geographical divisions would always set-up injustice. The privilege of any Nation always comes at the expense of others when sympathy grows into an illusion of "an imaginary common interest". Also of much importance, alliances must be chosen wisely as to not end up betraying the interests of our own Nation in order to defend these alliances. When they're formed without good justification, we end up wrongly following blind and passionate attachment instead of reason.
Hope this helps out!