The United States remained a largely agricultural nation until late in the 19th century. Unskilled workers fared poorly in the early U.S. economy, receiving as little as half the pay of skilled craftsmen, artisans, and mechanics. About 40 percent of the workers in the cities were low-wage laborers and seamstresses in clothing factories, often living in dismal circumstances. With the rise of factories, children, women, and poor immigrants were commonly employed to run machines.
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Explanation:
Geodesy, the science of measuring the Earth's shape and positions on it, allows the measurement of plate motion directly using GPS, the Global Positioning System. This network of satellites is more stable than the Earth's surface, so when a whole continent moves somewhere at a few centimeters per year, GPS can tell.
GPS uses a system of satellites to triangulate the position of a receiver anywhere on Earth. By using a network of receivers near plate boundaries, scientists can very accurately determine how the plates behave
