What provision of the fourteenth amendment serves as a cornerstone of struggles to win equality for certain groups?

The answer is the Equal Protection Clause. This is part of the 14th Amendment to the United States Constitution. This clause took effect in 1868, where it is necessitating that states assure the equal rights, human rights, and protections to all citizens.

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in the 1950s, country music came into its own before rock-n-roll took off in the 60s while jazz and classical music continued to innovate