Final answer:
The specific year for the first Star in Agricultural Placement and Star in Agriscience awards is not given. Instead, information provided relates to agricultural practices in the U.S. marked by corn production data and historical context from the USDA. These details underscore the evolution and recognition of excellence in American agriculture but do not answer the question directly.
Step-by-step explanation:
The first American Star in Agricultural Placement and the first Star in Agriscience awards were not specifically mentioned, suggesting that this piece of information is missing. However, to assist in understanding the significance of these awards, it's important to recognize that they are part of a long-standing tradition in American agricultural education and are typically awarded by organizations such as Future Farmers of America (FFA) to recognize outstanding achievements in agricultural science and work experiences in agricultural placements. The specific year the first awards were given is not provided in the information available. The data points provided from the US Department of Agriculture (USDA) about corn silage and grain corn production across the US form part of a larger discussion on American agriculture, but do not directly answer the question about the awards. For example, the reference to Wisconsin's high density of corn silage production could be due to the state's suitable climate and soil conditions for corn growth, as well as the presence of a large dairy industry that uses silage for feed. The decline in grain corn harvested west of the 100th meridian might be attributed to the drier climate and lesser rainfall in that region, which makes large-scale grain corn production less feasible without irrigation. Additionally, the approximation of agriculture's origins being around 10,000 years ago marks the beginning of human settlement and farming which led to the development of agricultural practices over millennia, eventually leading to modern recognition like the Star awards in America.