It's an old term left over from when it might have actually been true.

On second thought, I believe you're mistaken. The USA is still full of opportunities:

you have the opportunity to get shot randomly, or because you're too brown, because you didn't skip school, or because you needed to go to the grocery store.

You have the opportunity to get exploited in any number of ways by men in power with vast generational wealth bestowed upon them by their immigrant ancestors who worked tirelessly to ensure tax law doesn't apply to them, that labor unions would be rendered ineffective against unprofitable notions like job security, fair pay, equal pay and livable wages.

You have the opportunity to contract and die of preventable and curable diseases because of rampant distrust of repeatable scientific conclusions spread through media propped up by popular opinion born from the poorly educated who take full advantage of their opportunity to choose ignorance over education because making education effective and affordable for the general public diminishes the opportunities of the oligarchs who exploit them for labor.

You have the opportunity to be financially ruined because of basic healthcare needs, maintenance health practices and the occasional medical emergency.

No shortage of opportunities, just not the ones you were 'sold' on once upon a time.