Food and Water Watch recently published an excellent report on factory farming in the USA and a companion map detailing the location of factory farms state-by-state. The report’s Key Findings are
Between 1997 and 2007, there was a geographic and economic shift in where and how food is raised in the United States. Even a few decades ago, there were small- and medium-sized dairy, cattle and hog farms dispersed all across the country. Today, these operations are disappearing. The remaining operations are primarily large-scale factory farms that are concentrated in specific regions, states and even counties where the thousands of animals on each farm can produce more sewage than most large cities, overwhelming the capacity of rural communities to cope with the environmental and public health burdens.