Because a civil war is war happening within the same country, hence the literal name.
Answer:
Many died of diseases brought by the Europeans. This was the main impact of these voyages in the very short term. Later, Columbus's voyages led to the domination of the area from Mexico south to Peru by the Spanish. This resulted in the destruction of the major native civilizations like the Incas and the Aztecs.
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Houses were scarce, people had to live is cramped places, and overcrowded places. Political groups came together or emerged
Columbus had not known that there was land to the West, only China. He also had never been to China so he really had no idea what China looked like.