Chapter 4 - Food supply systems in Africa Agriculture in transition: Factors affecting food security. The agricultural production and food supply systems of a country depend on many factors including government policy, ecological potential, and the level of technology, inputs and skills of the agricultural producers.
The history of California can be divided into: the Native American period; European exploration period from 1542 to 1769; the Spanish colonial period, 1769 to 1821; the Mexican period, 1821 to 1848; and United States statehood, from September 9, 1850 (in Compromise of 1850) which continues to this present day.
The history of agriculture in the United States covers the period from the first English settlers to the present day. In Colonial America, agriculture was the primary livelihood for 90% of the population, and most towns were shipping points for the export of agricultural products.