HabitableZone

Flame » in reply to Thanks, ER. Now, a graph:

Some eyeball analysis...

If you take a mean of all those gray lines, Canada comes pretty close to an average and represents an environment and lifestyle very similar to the USA, and compare it to the red USA line, the two arcs start to diverge around 1980.

Now what happened to the US political and economic environment around 1980?

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