Unless you own a zoo you’re not going to be allowed to buy a tiger
There are certain states where you are allowed to have exotic pets, it will cost ridiculous money to do it, but you can.
We had a nutcase here in Ohio who let over 50 animals loose before he killed himself. It was mayhem all over the news, miraculously no one was killed or hurt. Unfortunately they had to put almost 50 animals down. Can you imagine driving along the freeway and see a sign that said : " Danger, wild animals roaming loose, do not stop!!"