Which city did NOT host an international exhibition in the U.S. in the late 20th century?

The correct answer indicates that Chicago did not host an international exhibition in the late 20th century, which aligns with the historical record of international exhibitions held during that time period. Chicago is indeed known for hosting the 1893 World's Columbian Exposition, but it was not a host city for any recognized international exhibitions in the late 20th century, such as the prestigious Bureau International des Expositions (BIE)-sanctioned events.

On the other hand, cities like San Francisco hosted the 1915 Panama-Pacific International Exposition and New York City hosted the 1939 New York World's Fair, which were significant events drawing international attention. Los Angeles also played host to the 1984 Olympic Arts Festival and other large-scale expos that attracted global participation. Thus, the absence of Chicago's hosting role in the late 20th century distinguishes this option as the correct response to the question.