The City Wall of Nanjing<span> (</span>Chinese<span>: </span>南京城墙<span>; </span>pinyin<span>: </span>Nánjīng chéngqiáng<span>) was designed by </span>Emperor Zhu Yuanzhang<span> (r. 1328–1398) after he founded the </span>Ming Dynasty<span> (1368–1644) and established </span>Nanjing<span> as the capital 600 years ago. To consolidate his sovereignty and keep out invaders, he adopted the suggestions of advisor Zhu Sheng to build a higher </span>city wall, to collect grains and to postpone the coronation. Then, he started to build the city wall. It took 21 years to complete, and used 200,000 laborers to move 7 million cubic metres of earth. The City Wall of Nanjing was among the largest city walls ever constructed in China.[1][2]<span> The enclosed </span>Nanjing City<span> is about 55 square kilometers.</span>
"<span>They found the soil unusable, and they had to rely on fishing and hunting for food" is generally true, although some people were able to soil rich enough for farming. </span>
one main reason why it started is because of different views on slavery and whether or not it should be legal also the election of abraham lincoln as president. hope this helped
