the Monro doctrine was a statement saying if you attack any of our neighbors and wish them harm we will defend them this was a statement used to say hey america over here we putting our foot down and saying no to colonialism this also kicked of the war of 1812
Checks and balances are controls built into our system of government which prevents one branch of government from asserting too much power over the others. For instance, the President may want to declare war, but he must first seek the approval of Congress.
