The answer is: Interest
United states prohibits workplace discrimination based on gender, race , or birthplaces. Because of this , regardless of the situation that we're born with, we shall not be prohibited to pursuing any type of career that we want.
Interest determines how much enjoyment that we will obtain from doing a certain activity. Choosing a career that match our interest will make us much more likely to spend a lot of time and effort to the career. This will increase our chance of being successful.