Ronald Reagan.
Jimmy Carter and Ike went to the service academies which is nothing like Harvard or Princeton. US officers are always in college.
Harry Truman was basically a state boss who inherited the throne. And Ford was a flight deck officer in WW2 when he got started. Nixon was just a supply officer.
I guess the main and last example of your ideal President was Ulysses S Grant, a failed shopkeeper, failed lawyer, wood chipper who made it big in our worst war to date because he had the guts and heartlessness and cunning to fight like Hell.
But he did not have the training to deal with men freed of a professional code of honesty and competence, he was neiither trained nor prepared for a city full of hostile equals and treacherous subordinates, and he is remembered as a weak President because of all the crimes of his underlings.
In our political system we don't listen to a leader because of who his dad was. There has to be a sense that this guy is a driving force, who would be uncomfortable and difficult to cross, who is respected for that by a ot of others, but for that reason, can herd cats and get things done by people less eager and decisive, who rewards loyalty, and could be approached with an idea from below if he isn't committed in his own mind. Part of that is animal charisma and a lot of it is a discipline of the mind. We have schools for organization in this country, forprofit schools that teach you how to run any company like an army general staff.
Once you can get a grubstake, say like $10,000 then earning money becomes systemic and automatic. Wealth is a sign you got your wiring together. No measure of morals of course but a guy who can herd a million bucks isn't farting his way through life. Unless he sells 200,000 fart vidoes for $5 each.
We have the most open and renewable system on earth I think, if I'm down on it its because we got stupid.
Some of us do keep an eye on the whole world, we're mocked for not having a REAL life.