Quote Originally Posted by DuncanONeil View Post

Does that not depend on the definition of opportunity?

Well here is one definition: From online Merriam Webster Dictionary
Main Entry: op·por·tu·ni·ty
Pronunciation: \ˌä-pər-ˈtü-nə-tē, -ˈtyü-\
Function: noun
Inflected Form(s): plural op·por·tu·ni·ties
Date: 14th century

1 : a favorable juncture of circumstances <the halt provided an opportunity for rest and refreshment>
2 : a good chance for advancement or progress

The fact of high school graduation rates may give the appearance of supporting the position you state. But did not every Freshman that entered high school have the same "opportunity" to graduate?
Based on the above definition, and what I was asserting prior, I would still have to say no, every freshman does not have the same opportunity to graduate.

Like "Star Trek"?

Well not exactly like "Star Trek," , on the other hand, maybe ... if the Klingons and Romulans were part of the "Federation" too...
Respectfully,
TS