What is the fine-grained topic of the following text: In 2009, CNN’s Money Magazine named Keller as one of the 10 “Best Places to Live” in the U.S. Keller has also been recognized as one of the “Nation’s Richest Cities” as of 2008, according to the U.S. Census Bureau’s American Community Survey. Only return the topic.
Keller's recognition as one of the best and richest cities in the U.S.