Today a dreaming Ukrainian is quite likely to instead get ripped away by conscription kidnapping teams and used as cannon fodder on the front, and not even make it to America. The reality changes but the rule of thumb is still good, you do the best with what you have and make yourself ready for opportunity you might not ever get.
Everyone, everywhere, tries to optimize their local situation as best as they can with the skills and knowledge they have available. The further one gets into understanding how mental health works, the more one realizes that mindset is a result of experiences usually more than it is of willpower. People in poverty are exerting willpower to the maximum every single day. People are anxious for a reason, and depressed for a reason - these do not pop up like some contagious airborne virus, they're a result of the setting and society and their place in it.