Right now there is no reason to believe that will change but we cannot predict the future. Thus far no language has remained the common one permanently.
That depends on the state/municipality. In my hometown there were zero public bathrooms available. That’s since changed because only really wealthy boomers can afford homes there so more businesses have them.
Except it WAS about slavery as that was the primary reason why the South started the war.
Your point would be akin to saying that the Second World War in Europe wasn’t just about the Axis invasions because there are also complaints that Germany built too many telegraph lines vs what was permitted in the Treaty of Versailles. I mean yes those exist but that doesn’t change that the war was really about stopping the fascist invasions.
"I mean they’re not entirely wrong, fighting slavery was a political tool not a moral imperative "
In this you seem to be arguing what the North’s perspective is on the war while entirely avoiding the fact the traitor states started the war specifically about slavery. This is what people are reacting to.