Dr. King's "I Have a Dream" speech: described how the U. S. had failed to apply the principles of the Declaration of Independence to African Americans.
urged people to use violence to end segregation.
argued that the U. S. would never overcome racism.
All of these choices are correct.

Dr. King's "I Have a Dream" speech described how the U.S. had failed to apply the principles of the Declaration of Independence to African Americans.

Explanation:

I Have a Dream is the title of a famous speech by Martin Luther King, which he gave on August 28, 1963. The speech summarized the most important demands of the Civil Rights Movement for the social, economic, political and legal equality of African Americans in the form of a future vision for the United States. It expressed King's hope for future agreement between the Constitution, particularly its principle of equality, and social reality, which was largely shaped by segregation and racism. The refrain-like, spontaneously improvised sentence "I have a dream" of the final passages became the title of the speech. This became one of King's most cited speeches, which exemplified his view of the American Dream, in which the rights to life, liberty and the pursuit of happiness would be the same for all men regardless of race.

b.   jim crow laws were enacted in northern states.