What was the major change in the u. s economy in the 1990s?
a. a more bank failures
b. more capital equipment manufacturing
c. higher impact of international trade
d. heavier reliance on services

The major change in the United States economy in the 1990's was heavier reliance on services. The correct option among all the options given in the question is option "d". It was during this period that a heavy boom came in the information technology sector and everybody started relying heavily on the services of this sector.

"teotihuacan was the cultural center of the zapotecs".