No, they haven’t hidden anything. You looked at the average temperature in the USA
you mean this graph:
and yap, the temp is pretty much the same in the USA insignificantly higher. but the world in 1935 was like this:
Now it’s like this:
that’s why you get a global graph like this:
So the US temp’s are pretty much the same as they were in the 30’s, but the world rest of the world didn’t have high temp’s in the 30’s so you get my point.