Shark Meat isn't very popular in the USA like it is in other countries as it contains a pretty high level of mercury and sharks are not really killed that often for the meat since they can become endangered.
Still Shark Meat is legal to buy and sell and and legal for human consumption if you want to eat Shark Meat in the USA.
Still it's also very hard to find Shark Meat unless you can find someone selling it and it's likely to be pretty expensive if you do want to eat shark meat but it is legal to eat shark meat in the USA.
Although you usually have to go to other countries to find and eat shark meat because like I said it's not that popular in the USA.