How did rich and poor americans contribute to the creation of a new economy at the end of the 19th century?

please give a detained answer!

They created a new economy by recognizing the issues that the poor people faced in 1890s to 1920. Remember the rich made off money of the poor, after a while when the poor discovered that was happening. Workers went on strike for the such low income and working conditions.

a peace conference held after the surrender of japan

an international conference held near the end of world war ii

a meeting of the victorious nations after the defeat of germany

a summit meeting between the united states and the soviet union

i need the diagram.