Animal products and by-products
Any kind of meat or meat products are not allowed in the U.S and it is most likely to be confiscated at the US bored by Customs officials. Fresh, canned, dried or cooked meat is most likely to be banned if you are coming into the US from another country.
The chances of infestation are what the US wants to control. The ban is for the good of the country and Americans. Meat can carry all sorts of germs and microbes which might affect humans and other meat products too.