Its objective was to declare that the New World and the Old World to be separate entities. It opposed European colonialism in the new world. The Latin American countries were gaining independence from Spain and Portugal. The US was worried there would be new attempts by Old World countries to try and interfere with or try to conquer the newly independent territories and it would become a battleground. The doctrine was declared this. wouldn't be tolerated. The New world wanted to be left alone to exert its influence.
The threat of France possibly spreading the its monarchial government was a catalyst
The meat grinder in the Korean war was actually a strategy that they used. There were stills combats that were being deployed to the war to fight. And most of the attacks are initiated by one or single combat unit. The attack strength is on the lower left while the defense is on the lower right.
