how did the voting rights act of 1869, 1920, and 1971 expand the blessings of liberty to more of the United States population?

Industrialization went forward in the Northwest. A rail network and a telegraph network linked the nation economically, opening up new markets. Immigration brought millions of European workers and farmers to the North. In the South, planters shifted operations (and slaves) from the poor soils of the Southeast to the rich cotton lands of the Southwest.