He built railroads and hotels in Florida, bringing tourists and migrants.
Fundamental. Essential means necessary, primitive typically means ancient, and critical means important.
Your answer would be The two countries are strong trading partners.
The United States and South Korea have a very strong relationship between each other, since they both don't like North Korea. The United States is allied with South Korea. Because of the strong bond between them, they must be good trading partners, they can always go to each other for trading purposes due to their close relationship.
Ummm like the 50 states of America?
Washington
Wyoming
West Virginia
and Wisconsin
