Excerpts from the report Introduction: This chronology lists major events in the history of U.S. agriculture. A source to which the reader may turn for additional information on the subject is included with most of the events. Generally, each source appears only once, although it may apply to more than one chronological citation. The reader interested in a particular subject can compile a short bibliography by consulting each citation for that subject. Key inventions, laws, changes in land policies, individuals, contributions, the development of institutions, and the introduction of new types of crops and livestock are included. There are also notes on all commissioners, secretaries of agriculture, and agencies established in response to new programs in the U.S. Department of Agriculture.