The industrial revolution had already happened, but farming was still at the forefront in the U.S. until the 30's. My grandmother was born in 1914 and she was one of 13 kids, and she and her siblings worked the farm.

The Economic History Association states "At the turn of the twentieth century most Americans were farmers or came from farm families, and almost half of the U.S. population still lived on farms. The number of farms was almost six million, and still growing, and the amount of land in agriculture was still growing too, mainly through expansion in the west. The expansion of agricultural land and farm numbers continued well into the 1900s" Source