Which aspect of the March on Washington sent a powerful statement to the United States and the world?

Could anything have been done through compromise to stop it, or did it have to happen?

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal

Ahistorian who compares the expansion of political systems to the expansion of economic systems is organizing history by