Why did earl warren become Chief Justice?

Explanation:

After Chief Justice Fred Vinson died in September 1953, Warren became the likely choice as a successor because of his law enforcement experience. ... Warren joined the Court in the midst of some of its most important issues – racial segregation in public schools and the expansion of civil liberties.

Fred Vinson died unexpectedly.

which statement best describes the relationship between the fourteenth amendment and the african american civil rights movement?