Black Power mean? What was the impact of this movement on African American identity? Is the concepts outdated if used today in the 21st century?...

From a historical perspective, what does the phrase "Black Power" mean? What was the impact of this movement on African American identity? Is the concepts outdated if used today in the 21st century? Or, is there some new perspective that African Americans should employ as they attempt to gain full access to the American identity?