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What is the Monroe Doctrine?

The Monroe Doctrine was a U.S. policy of opposing European colonialism in the Americas beginning in 1823. It stated that further efforts by European nations to take control of any independent state in North or South America would be viewed as "the manifestation of an unfriendly disposition toward the United States."At the same time, the doctrine noted that the U.S. would recognize and not interfere with existing European colonies nor meddle in the internal concerns of European countries. The Doctrine was issued in 1823 at a time when nearly all Latin American colonies of Spain and Portugal had achieved or were at the point of gaining independence from the Portuguese and Spanish Empires.

When did the Monroe Doctrine begin and end?
1801-1829

The correct answer to this open question is the following.

We are talking about the years after the end of Worl War II; when General Douglass MacArthur and the US troops had occupied Japan, during the time of Emperor Hirohito. The Allied and Americans helped Japan to recover after the devastation of the war. Japanese people saw how the American troops played baseball and they liked a lot. That is when they adopted the sport in a case of cultural diffusion when the culture and customs of one country influence other nations. The Allied troops though that the professional practice of baseball could boost the morale of Japanese people and some companies financed the creation of pro teams.