Answer:
Korea and may other states in Asia had a tributary relationship with imperial China. Their rulers were supposed to send annual tributes - gold, jewels, animals, etc. - to the Chinese emperor. China was the center of the Asian system, the highest civilization of all and  its ruler was superior to anybody else, the Son of Heaven did not have equals. It was the practice during the Ming dynasty and later. 
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Answer:
 How did Islam spread throughout the various regions of Africa? 
Islam gained momentum during the 10th century in West Africa with the start of the Almoravid dynasty movement on the Senegal River and as rulers and kings embraced Islam. Islam then spread slowly in much of the continent through trade and preaching.
How were African religious beliefs affected by Islam?
Traditional African religions generally believe in an afterlife, one or more Spirit worlds, and Ancestor worship is an important basic concept in mostly all African religions. Some African religions adopted different views through the influence of Islam or even Hinduism.
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<span>The Nazis pioneered the use of radio to reach great distances and to a large audience at a relatively low cost. German propagandists were transmitting no less than eleven hours a day of programs, offering most of them in English as well.German propaganda minister, Joseph Goebbels claimed the radio was the "eighth great power". He propagated the anti-Bolshevik statements of Hitler and aimed them directly at neighboring countries with German-speaking minorities.</span>