A republic is a confederation of independent state governments that form a large federal government. In a republic, the people choose who will govern them. These people are known as representatives. Thus answer 2 is correct.
You would do an experiment. An experiment is something we do to test our hypothesis and these experiments help us produce data, conclusions, or theory models.
Answer:
The Korean War was an important development in the Cold War because it was the first time that the two superpowers , the United States and the Soviet Union, had fought a 'proxy war ' in a third country. The proxy war or 'limited war ' strategy would be a feature of other Cold War conflicts, for example the Vietnam War.