Stephen Douglass was a Democrat elected to the U.S. Senate in 1858. Douglas defeated Abraham Lincoln to obtain his Senate seat. He was a supporter of the idea of popular sovereignty, the belief that the settlers in newly admitted territories should determine whether the area would be slave or free. Douglass received the Democratic nomination for president in 1860. Douglass support of popular sovereignty led to the splintering of the Democratic Party into Northern and Southern factions. Northerners opposed secession while Southerners supported it. The splintering of the party led to their defeat and the election of the Republican Abraham Lincoln in 1860.
10 dillion deaths b/c the brutal rubber trade
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The Korean War. North and South Korea are still technically at war. An armistice was signed in 1953 to halt fighting, but no final treaty was signed, unlike after World War 2.
United States, NATO allies and South Korea fought against North Korea, who received aid from Chinese forces.
This an example of actual combat during the so-called Cold War between the United States and the Soviet Union between 1945-1991. The two sides had different ideologies (democracy vs. communism), which led to friction.