Help what caused the walkways at the hyatt regency hotel to fail?

Although that design proved to be in violation of Kansas City's minimum load requirements, the primary cause of the failure was a change from the original design to a double-rod system, one hanger rod connecting the ceiling to the upper walkway and the other connecting the lower and upper walkways.

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dr. kings dream speech

explanation:

it was late in the day and hot, and after a long march and an afternoon of speeches about federal legislation, unemployment and racial and social justice, the rev. dr. martin luther king jr. finally stepped to the lectern, in front of the lincoln memorial, to address the crowd of 250,000 gathered on the national mall.