Answer:
Topic chosen: A: Washington and Monroe believed...
In general terms it can be said that the belief both expressed by George Washington, and much later James Monroe in his Monroe Doctrine, was pretty much correct in the sense that no nation should have the right to either influence, and much less pressure, another into doing, or adapting, to the principles and customs that the more powerful nation intends to force, through intervention. In today´s world, 21st century, the entire world has seen that this influence and this involvement can cause more harm, and actually produce the opposite effect, from what it was intended at first. An example of that can be seen with the interventions of the U.S in such nations as those in Latin America, or in the Middle East.
However, we must also come to another point here and that is, that the influence the United States exerted on the European front, especially during the two world wars became essential, and crucial, to the desintegration of the conflict, the prevention of further deaths and destruction. And it also prevented an even worse conflict from arising as, after the Second World War ended, the Soviet Union pretended to extend its Communist ideals by force throughout the Old Continent.
Never more than during the First, Second and Cold Wars was the intervention of the U.S more effective, efficient and necessary. However, there came a point where, empowered by the success of interventionism, the United States began to lose its boundaries and forgot that its role was not to dominate other nations, but rather to extend help as a response to its being one of the most powerful and rich nations in the world. The abuse of this power, and this responsibility today, has led to conflict between the nation and other nations, including those in Europe. Today, more than even, Europe does not need the influence or intervention of the United States, they themselves being powers in their own rights. The United States´ continued attempts at forcing issues of their interest on others has been, instead of helping, causing division and a growth of dislike and even hatred towards the country.
So in conclusion, although initially the ideas of Washington and Monroe were on point, there came a time in history during the twentieth century in which the United States´ intervention in international affairs did make a difference and was necessary to restore peace. A giant like the U.S could not simply stay impavid to the struggles of Europe and the threat Nazism brought. However, that power of intervention should have been curtailed afterwards, as Europe, in its own right, is a power and does not require other nations to influence them, or intervene in their affairs.