The Monroe Doctrine was introduced in 1823 and had a lot of fascinating points. Two of the major points were, Europe could not interfere with countries in the Americas and the United States could not interfere with Europe. This played a huge part in the Western Hemisphere as Presidents would always invoke the Doctrine during foreign affairs. The most recent example, President Reagan used the Monroe Doctrine to fight and stop communism in the Americas.
And price control that limits the amount a property owner can charge for property. This prevents the price from being hiked from the predetermined percentage.
try and search it up like copy the question and google has some article or answers i don't really understand that work because i haven't done that but search it up it will prob tell you the answer.