Definition of Implicit: implied though not plainly expressed
Definition of Bias: prejudice in favor of or against one thing, person, or group compared with another, usually in a way considered to be unfair
(So just put the two together)
Answer:
The American dream is to fulfill whatever it is that you may want to be.
Explanation:
The idea is that America is the land of opportunities and presents the ability to become whatever you dream of and be "free" to accomplish this.