If you are talking about the time around slavery then, the north wanted to wourk out diffrences because they didnt want slavery but didnt want war either
Secondary source is documents written after an event has occurred. providing secondhands accounts of that event
The Cold War<span> Comes to </span>Asia<span>. In the closing years of World </span>War<span> II, </span>American<span>military and diplomatic representatives in China recognized that civil </span>war<span> was likely to erupt between the Nationalist-controlled government headed by Chiang Kai-shek and the Chinese Communists led by Mao Zedong.</span>
I'm pretty sure the answer is: primary sources.
