Explain how the united states gained influence in latin america

The correct answer to this open question is the following.

The United States has gained influence in Latin America since the times of President Monroe when his administration dictated the foreign policy called "Monroe Doctrine," in which he made clear to European powers that they had to stop messing around in the Latin American issues. European powers would not be able to interfere with issues in Latin America. If they did so, that would be considered an aggression against the United States. From that time, the US has been the country that has influenced Latin America issues because the US has many economic and political interests in the region.

in his book, the riddle of the rosetta stone, james giblin talks about how there was a young british polymath and physician named thomas young who made a lot of advances on the deciphering of the rosetta stone. he says that even though young made a lot of mistakes because he was working under false assumptions, he also made huge contributions like deciphering three out of the seven symbols (more than anyone else before him). young published his findings and continued his good work but he wasn't able to progress much further due to some unfavorable situations, he still laid the basis for many other scholars and of course for the man who has been generally known to have deciphered it, jean-françois champollion