Purchase of Alaska
Just looked it up
On August 23, 1939–shortly before World War II (1939-45) broke out in Europe–enemies Nazi Germany and the Soviet Union surprised the world by signing the German-Soviet Nonaggression Pact, in which the two countries agreed to take no military action against each other for the next 10 years.
Answer:
Popular Sovereignty
Explanation:
When the representatives are elected to congress, the principle of government that applies is the Popular sovereignty. The principle of popular sovereignty states that the authority and power to create as well as sustain the government lies among the people of the country. It is based on the concept that people are real rulers in a democracy and the elected representatives are servants of people who are the sovereigns.
I think it's because slavery costs less...just a guess.