How did technology help unify the nation?

Technology affected American lifestyles in two main ways. First, it gave Americans more leisure time. ... The invention of radio and the boom in movies, combined with the growing availability of cars, allowed Americans to pursue a lifestyle that was much more centered around fun than it ever had been before.

loess contribute to the flooding of rivers by providing the silt that is washed into rivers and constantly raises the bed of the rivers. this elevation above the surrounding flood plains and dams allow the river to overwhelm the dams and flood thousand of square miles of neighboring flood plains.

b. the american revolution