The Monroe Doctrine<span> was </span>important<span> because it stated that the newly independent United States would not tolerate European powers interfering with the nations in the Western Hemisphere, and if the European powers did interfere, then the United States would retaliate with war.
*Hope this helps</span>
O The history of all hitherto existing society is the history of class struggles.
Louisiana purchase of 1803 doubled the size of the united State give the country complete control of the port of new Orleans, and provided territory for westward expansion.
