When he sent troops to Lebanon to put down a revolt against its pro-American government.
-i got chuu fam!
Nixon, which surprises most because of the Watergate Scandal that basically defines his presidency.
Monroe was constantly objecting to the fact that the constitution did not explicitly mention or provide for spending the money of the government on road and canal projects (which he believed were very essential projects at that time).
Therefore, Monroe consistently vetoed the acts of the congress for providing the funds that are to be used on such projects.
On the other hands, other states were left to do any internal improvements on their own.
Order and law in this crazy world
I believe it was "overpopulation."