Natural resources, physical capital, population, human capital,technology, and law
The Soviet Union had set up official border stations in which you had to cross to get to the other side. Eventually, they had set it up so they're was only one safe way to get to West Berlin, just one border stations. These border stations were quite strict, as they had people trying all sorts of crazy ways to get to West Berlin.
e) sounds like the best choice.
Cultural unity was less apparent than its diversity, Africa is home to 2000 distinct languages.
