Dairy industry in the United States
The dairy industry in the United States includes the farms, cooperatives, and companies that produce milk, cheese and related products such as milking machines, and distribute them to the consumer. By 1925, the United States had 1.5-2 million dairy cows, each producing an average of 4200 lb of milk per year.
Source: Wikipedia — Dairy industry in the United States (CC BY-SA 4.0)