Summarize the excerpt: "But one hundred years later, the Negro still is not free. One hundred years later, the life of the Negro is still sadly crippled by the
manacles of segregation and the chains of discrimination. One hundred years later, the Negro lives on a lonely Island of poverty in the midst of a vast ocean
of material prosperity. One hundred years later, the Negro is still languished in the corners of American society and finds himself an exile in his own land.
And so we've come here today to dramatize a shameful condition
(Summarize this)

Explanation:

But one hundred years later, the Negro still is not free. One century later, the life of the Negro is still sadly crippled by the

chains of exclusion and the chains of unfairness. One century later, the Negro lives on a lonely island of poverty amid a vast ocean of material prosperity. One hundred years later, the Negro is still languished in the corners of American society and finds himself an exile in his land.

And so we've come here today to dramatize a shameful condition

One hundred years later the life of the Negro is still sadly crippled by the manacles of segregation and the chains of discrimination. There will not be tranquility in America until the Negro is granted citizenship rights. We must forever conduct our struggle on the high plane of dignity and discipline.

Explanation:

I just summarized it , i hope  you get the right answer cause sometimes i doubt myself.

faulty parallelism is a construction in which two or more parts of a sentence are equivalent in meaning but not grammatically similar in form.

the correct version of this faulty parallelism in the sentence is:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.

the problem is the last sentence, the first two have a basic subject+verb+object structure.

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in all three sentences:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.