How did the march to washington have an impact to the speech

reverberated - a loud noise repeated several times as an echo
heart palpitation - heartbeat sensations that feel like your heart is pounding or racing.
trobadour - a French medieval lyric poet composing and singing in Provençal in the 11th to 13th centuries, especially on the theme of courtly love.
progressed - to move forawrd or onward at a pace.
rostrum - a raised platform on which a person stands to make a public speech, receive an award or medal, play music, or conduct an orchestra.