What do the trains, ships, farms, and telegraph posts on the right-side of the painting represent?

a painting showing a large white woman walking over the hills and forests of the countryside with a people driving covered wagon, stagecoaches, and trains. She holds a cable in her hands and strings it on poles as she walks. White settlers walk beside her. In front of her, Native American families and bison run away. train at her feet.

American inventions
Places to visit
Progress moving to the West
Technology developed in France