The way that urban flight changed the nation's cities was by causing gentrification to happen.
Urban flight refers to a situation where people who stay in cities move to other areas which are more rural in nature.
As a result of this, more areas were left up for sale and wealthier people bought them up which led to gentrification.
Find out more on gentrification at https://brainly.com/question/14305750.
#SPJ1