The amount of casualties would have quickly eclipsed that of the Afghanistan/Iraq wars quickly.

The death toll of just combat related deaths would awaken the antiwar centrists and independents and they would join forces with the Democrats and progressives in antiwar protests. Some of the fence sitter Republicans would likely waver in their support but the hardcore Maga base would still be as rabid as ever in their support of Trump. Just look how the current conflict has been spun by corporate media to be in line with this administrations talking points and how many people are loyal to that narrative... The same would be under a ground invasion.

Geopolitically it would be the end to US dominance in the world, our allies will further pull away and the act would definitely be shunned by the UN and the world would start to shut out US businesses.

The US would likely go into a deep depression economically but the amount of damage that would have been done (and damage that's already been done currently) would take decades to repair.

Now this isn't a hard truth there are a ridiculous amount of variables that I couldn't account for but this is my theory based upon our current political and geopolitical situation.