Simplify the following text for a Grade 11 native English-speaking person.
Original: The first purpose-built shopping center in the United States , opened in Kansas City , Missouri in 1922 , knowingly took the name of `` Country Club Plaza '' and adopted Spanish architectural details .
Simplified: The first shopping center in the United States , opened in Kansas City , Missouri in 1922 , was called `` Country Club Plaza '' and had Spanish-style architectural details .