Answer:
work in technical industries
Explanation:
During the late 1800's the industry in the United States was booming, and with the rate it was growing it needed more and more labor force. This attracted lot of people from abroad to immigrate toward the United States, as they had ensured jobs and were going to work in the technical industries. The people were encouraged and optimistic moving in the United States, stop working in agriculture and start a new life in new country, working int he industry, and living in a city instead of rural areas.
For much of the last quarter century, the leading theory of the driving force behind tectonic plate motions envisaged large scale convection currents in the upper mantle, which can be transmitted through the asthenosphere.
