But if we look at the period literature for any period . . .
I mean, look at newspapers and evening news broadcasts for any week and it will look like the most pivotal week in history of modern democracies and advanced economies!
Which doesn't change that such a climate was influencing decision-making in the period.
You said they were the largest exporter until the late 60s.
Which was also true until the mid 60s. Some level of imports does not negate being a major net exporter especially when you take into account how much of global oil production was also controlled by an ogliopoly of seven oil companies five of which were American.