Countries like Vietnam, Cuba, and North Korea have what type of economic system?

Cuba currently operates under a form of a Communist economic

system. Although this has dramatically improved the country in a  

number of ways, the stubborn sanctions placed on them from the

United States have crippled their efforts to a large degree.

Explanation:

answer; the correct answer to the above statement is world trade center towers were build///110 story north tower of the original world trade center was