Which aspect of the march on washington sent a powerful statement to the united states and the world?

It was the size of the crowd.  Thousands marched to the Lincoln Memorial where they called for more freedom and more job opportunities.  These were denied to many African Americans due to the system of segregation.  Many prominent speakers lent their voices to the march including Dr. Martin Luther King, Jr.

meaning the clothes cost alot of money

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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