Because it has something to do with the geographical conditions in the United States. Because the United States has great advantages in agriculture, there will be abundant precipitation in summer in the United States. Moreover, there is plenty of light, which is very beneficial to the growth of crops. And there are many plains, which are very suitable for some mechanized agriculture and animal husbandry. However, China's terrain is complex, and there will be some difficulties in cultivated land, which is limited for some areas that use mechanical agriculture.
Therefore, the geographical conditions in the United States are very superior and the industrial level is very developed, so they can get food more easily, so they don't worry about eating and drinking. Not only is their pork flat, but beef is also cheaper than China. In addition, the United States is the world's largest exporter of meat and food. In our impression, raising pigs is dirty and tiring, but it is not suitable for America. They use mechanized pig farms, so they are completely different from the pigsty we remember.
Moreover, they raise pigs in a very orderly way, and even make people look like workshops for processing mechanical products. Their pig farm will have a lot of equipment, such as feeding pigs, disinfection and cleaning, all of which are automated. It doesn't need many people to take care of the pigsty, so the possibility of swine fever is also very low. Americans have also cultivated pig breeds and humpback pigs. This breed of pigs has a very high lean meat rate and a fast growth rate. Generally, it can be released after 6 months of growth.