提高听力同时，你还可以了解到美国历史上的一些重要事件。请感兴趣的你一听为快吧！

<注意>地区、海洋、国家大写
hints：Henry Clay;Missouri
In 1850, the United States was a large country, full of contrasts. New England and the Middle Atlantic states were the centers of finance, trade, shipping and manufacturing. Their products included lumber, machinery and textiles. Southern states had many farms that used slave labor to grow tobacco, sugar and cotton. The Middle Western states also had farms, but they were worked by free men. In 1819, Missouri asked to become a state. Northerners were against this because 10,000 slaves lived there. Because the constitution allowed each new state to elect two senators, new states could change the political balance between "free" and "slave" states. Congressman Henry Clay suggested a way to make the North and South happy. Missouri would become a state with slaves. Maine would become a state without slaves. The Missouri compromise was accepted.
在1850年，美国是一个充满对比的大国。新英格兰和大西洋中部各州的金融，贸易，航运，和制造业中心。他们的产品包括木材，机械，纺织品。南部的州有许多农场使用奴隶劳动的种植烟草，糖，棉花。中西部的州也有农场，但他们是自由人的工作。在1819年，密苏里州要求成为一个州。北方人都反对这一点，因为一万名奴隶奴隶生活在那里。因为宪法允许每一个新的州选出两名参议员的，新的州可以改变的“自由”和“奴隶”状态之间的政治平衡。国会议员亨利克莱建议一种方法，使北方和南方的快乐。密苏里州将成为一个奴隶的州。缅因州将成为一个没有奴隶的州。密苏里妥协被接受。