The establishment of ______ areas in the 1990s led to greater economic integration across national boundaries.

A) socialist
B) free trade
C) nonprofit
D) democratic

The establishment of free trade areas in the 1990s led to greater economic integration across national boundaries as they encourage trade between countries by removing tariffs, quotas, and other trade barriers. The other options, socialist, nonprofit, and democratic, do not have a direct correlation to economic integration.