re: How would the US be different if women were never allowed to vote?

Definitely less Democrat political domination so most of this social engineering and environmental insanity would not exist.
Russia would have never invaded Ukraine.
China would have never developed a deadly Corona virus and released it against the world.
Iran would be in check and not a nuclear threat.
Our economy would be much more stable with lower inflation and federal debt.
Our border would be much more secure and sanctuary cities would not exist in violation of federal immigration laws.
Crime in general would be greatly reduced due to reduced influx of criminal elements across our borders and these ridiculous laws that reduce criminal penalties which embolden criminals would not exist.
None of this fake global warming data would be supported as credible.
This bullshite gender identity phenomenon would not exist.

And don't get me wrong: women have contributed to society in many positions ways but their support of the Democrat Party has translated into a net negative overall.