What event caused Kanye West to accuse George W. Bush of not caring about black people in 2006?

In 2006, when Hurricane Katrina devastated the greater New Orleans area in Louisiana, the emergency response was slow and ineffective. As a result, many lives were lost and people who did survive had their lives changed forever. Because the vast majority of the victims of the hurricane were black people, Kanye West said on television that George W. Bush did not care about black people.