Increased productivity is the main contributor to economic growth in U.S. agriculture.
It is called division of labor
<span>The assignment of different parts of a manufacturing process or task to different people in order to improve efficiency. In division of labor, people take the jobs they are best suited for. The society that is related with division of labor is called an organic society.</span>
"The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago, to the beginning of the Devonian Period, 419.2 Mya.<span> <span>Wikipedia."
https://www.google.com/search?q=He+Silurian+period+occurred&rlz=1C1RUCY_enUS760US760&oq=He+Silurian+...
</span></span>