Answer:
Nowadays, North Korea is a country ruled by an autocratic ruler (that is to say, a kind of government where one person has all the power, in this case, a dictator) in a one-party system (the Workers´ Party of Korea), in what is called the Kim Dynasty (nowadays Kim Jung Un is the Chairman and absolute ruler of the country). The Kim Dynasty has ruled the country since 1948.
An immigrant can become a permanent resident of the United States if they become a Green Card Holder. Good luck!
By giving them land for farming.
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It was important because it proposed a completely different view of the universe and the position of the Earth and Sun within it. Prior to Copernicus, it was thought that the Earth was stationary and that everything in our galaxy revolved around it. However, the heliocentric model proposed a different view - it means that the Sun is actually the center of the galaxy, and everything within the Milky Way, including the Earth, revolves around that star.