Answer:
Nations needed more raw materials.
Explanation:
Day and night occurs because the Earth revolves around the Sun, and when the Earth revolves, different parts of the Earth get sunlight at different times. When it is night in one place, it is daylight in the other. This is because we only have one Sun and wherever the Sun is, that is where it will be bright.
Well I think they need to be able to write since most historians have to write a thesis in the career
Zheng He's first voyage (1405-1407) began in July 1405. They set sail from Liujiagan Port in Taicang of Jiangsu Province and headed westward. The fleet had about 208 vessels total, including 62 Treasure Ships, and more than 27,800 crewman. They traveled to present day Vietnam.