What factors contribute to american farming success?

It is  increased productivity is the main contributor to economic growth in U.S. agriculture. This data set provides estimates of productivity growth in the U.S. [ farm sector for the 1948-2009 period, and estimates of the growth and relative levels of productivity across the States for the period 1960-2004.

sediment layers stop spreading when they reach a barrier or they run out of sedimentary material. lateral spreading is the movement of gently to steeply sloping, saturated soil deposits caused by earthquake-induced liquefaction. i hope this . : )