This unofficial boundary is known as the Iron Curtain.
Winston Churchill expressed this concept of an Iron Curtain in a post World War II speech. In this speech he is referencing the imaginary border between the Soviet Union and their satellite nations, and the Western portion of Europe. This "iron curtain" symbolized the two different approaches to economic and government policies in Europe after World War II. The Western European countries were mostly capitalist while the countries under Soviet influence were mainly communist.
The Missouri and Mississippi Rivers are transportation_arteries and flow into a body of water called the Gulf of Mexico, Atlantic Ocean: This body of water carried European explorers & immigrants to North V Atlantic Ocean.
The best options from the list as to why Reconstruction failed to work as hoped are "<span>B) Southern whites did not want to give so much freedom to blacks" "</span><span>D)Lack of unity in government took away the focus
of Reconstruction" and "E) Southern states were too poor to manage
Reconstruction programs.</span>"