Astrology, lol. But to be less vague, (according to dictionary.com) "the study that assumes and attempts to interpret the influence of the heavenly bodies on human affairs." So things like "horoscopes" fall under that.
Astrology is the belief that heavenly bodies influence the affairs of people.
Astrology is the study of the movements and positions of celestial bodies to interpret how they influence human affairs and natural world events.
Traditionally, international affairs fall under the Senate in the United States.
The Senate! :D
They invaded Grenada and replaced the government.
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There were attempts by the British to Colonize Afghanistan between 1839-1842. The Afghans soundly defeated the British Army in 1842 and let go of one survivor: Dr. William Brydon to be a witness to the British. The British then tried to set up a system where Afghans were in charge of their internal affairs while the British exerted influence over Afghanistan's external affairs - not making the soviet Union very happy.
The Kaiser legislature had a influence over international affairs, but very little control over local affairs of the city-states.
Dollar Diplomacy
Oil and religion (Islam)