Over 150 years ago, Abraham Lincoln and Stephan A. Douglas held seven debates as they campaigned for a Senate seat in Illinois. The debates focused on the issue of slavery and its expansion into the territories. Douglas helped overturn the prohibition on slavery in the territories of Kansas and Nebraska with the Kansas-Nebraska Act. Referred to as popular sovereignty, citizens in Kansas and Nebraska, not the federal government, could determine whether slavery should be allowed to exist in these territories.
The geographic boundaries in the Cold War were dictated at the end of the 1940s, due to the Cold War between the Soviet Union and the United States. The Soviet Union wanted to spread Communism in many parts of the world. In opposition, the United States wanted to prevent the spread of Communism around the globe
The open door policy impacts lasted for decades and they have three major impacts; increase Chinese backlash against foreigners. Chinese and American conflict with Japan. Increased US interest in East Asia
