OOC: I do.
IC: 1970 is too late, by then LBJ's Great Society had shown amazing success, he'd been reelected in 1968 by just as big a margin over Reagan as he did over Goldwater in 1964, in 1970 LBJ's poll numbers were in the 70s the push for UHC was under way the Republican parties right wing was crushed after two back to back super losses, 1960 POD maybe, but 1970s too late, hell America has been headed left since 1932 always somewhat slower then Europe.
IC: Which is why the US has always been the "odd man out" in the Americas. Sure they're the most powerful, their power doesn't come from having a nanny state or a string of immoral governments. The US might be wealthy, but conservative doesn't have to mean poor, unlike what many Yanks would like to believe.
The average annual income ($US 38,000) in the US is lower than in Canada ($US 40,000), Chile ($US 39,000) or Argentina ($US 39,000), even though the US has a higher per-capita GDP. While the average Canadian was usually better off than the average American, things were different (Canada has an unbroken history of democratic government equal to that in the US, while having never had a civil war. Chile and Argentina had a history of military coups until the mid '70s, and both only returned to true civilian government in the early '80s) in Chile and Argentina until the mid-'80s.
To make the US stay in line with the rest of the Americas, a POD of 1970 might be a bit late, but doable. The best would be the 1968 US election. Maybe Vietnam turns into a debacle in '67 or '68 instead of in '71. So LBJ either doesn't seek reelection or tries and loses. A different Republican candidate would help, especially against a typical LBJ "no-holds-barred" campaign. Someone moderate, who can A: beat LBJ (or his annointed successor) and B: subsequently crash and burn over Vietnam and the economy, an open the door for a conservative successor from either party to ultimately turn things around.
OOC: A liberal wank US, a rapidly stabilizing (and rich) South America, and a more conservative Canada. A rising tide that floats all boats.