Ussr, China, North Korea, South Vietnam, Cuba
Antietam is the bloodiest day in American history
Based on exams I have taken before, I believe the answer would be "The company that originally constructing the canal could not afford to finish the project."
I hope this helps!!
The GDR stated it was constructed as an "antifascist protection mechanism" in order to keep out external threats and keep the east Berliners safe in their "Socialist Paradise" but in reality it was to keep people in since many were trying to emigrate out of the communist zone and the GDR would fall because of emigration.