求翻译：　　美国的废奴运动历史明显地比前述的国家较为激烈及复杂。它不仅为美国18世纪末至19世纪初的历史主轴，而且更爆发了美国历史上唯一一次的内战－－南北战争。是什么意思？

U.S. abolitionist movement, the history of significantly more intense than the aforementioned countries and complexity. It is not only for the United States 18th century to early 19th century history of the spindle, but also broke out the only time in American history, civil war - the Civil War.

The United States clearly the abolitionist movement history than the countries mentioned earlier is more intense and complex. It is not only to the United States in the early 18th century to 19th century history, which revolves around the history of the United States and only 11 more outbreaks of ci

　　US's waste slave movement history is obviously more intense than the forecited country and is more complex than.Not only it for American 18 century's end to the beginning of 19th century historical main axles, moreover erupted in the American history the only civil war - - Civil War.

　　United States abolition movement history clearly is more intense and complex than first mentioned countries. It not only for the United States in late 18th century to early 19th century history of the spindle, broke out and more United States-the only time in the history of the civil war-the Ameri

　　United States abolition movement history clearly is more intense and complex than first mentioned countries. It not only for the United States in late 18th century to early 19th century history of the spindle, broke out and more United States-the only time in the history of the civil war-the Ameri