Agree with the majority falling into a centrist band, but that's also only my perception of what other people think. The best study I was referencing before was only a ten year study.
But...the center moved. Many times. Centrist from pre-ACW meant things like supporting the Missouri Compromise.
In more modern times, the big shifts were those 'leftward' (progressive movement of the 1910's, New Deal, Great Society) and then a counter-reaction which started with Reagan. Reagan more or less killed off the Great Society changes,
but after-effects got rid of key New Deal provisions (like Glass-Steagall) and even earlier anti-trust rules.
Ideologically, there seems a drive mainly from the modern right to return to the pre-progressive reforms, trying to get back to
the level of Gilded Age freedom from pesky anti-trust rules.
In some cases, there are good arguments that there has historically been excessive regulation - in the sense
that it impacts growth. The problem is, there are only imperfect solutions ever, and both sides will put on
rosy shades toward change in their own direction. In the case of much of the 'unneeded' regulations, the
only empirical evidence we have of operations without them is frightening. And the slow relaxation has helped
create a wage-imbalance, in conjunction with the assault on labor (treating it like a simple commodity).
The crux of the issue is that the foundation of our society is broken however. Concepts such as a strong
right to private property and valuing everything by the standards of Mammon predetermine that we will
end up with a conflict between what makes people happy and the societal system of worth. This is NOT
human nature - but it may be needed for progress.