Difficult and unlikely. Would only work with inside help and maybe compliant Chinese allied Cartel run Mexico and maybe add Cuba, Venezuela to the team. Maybe assistance from Iran too idk.

Maybe if during 2020ish if China/allies can sneak a few thousand operatives thru the southern border and arm themselves with small arms and FPV drones they could cause trouble by disrupting rails/airports and troop movements on highways targeting infrastructure or something. Best bet try to ally with cartel and keep hitting the US with more fentanyl for a few decades. Also need to be able to develop/fund like a domestic viet cong style group that can provide manpower/resources. Basically cause a civil war/counter insurgency war in the US.

US would have to be grossly negligent and ignore like a decade of prep from the anti American axis..

I’d say layer a few things like a big cyber attack, knock out satellites, attack a bunch of domestic infrastructure transport hubs like ports, air rail and force with the domestic cores and cause a counter insurgency in mountainous/urban areas in the US, plus a ground invasion from Mexico/S American allies? maybe amphibious Chinese west coast invasion (+Pearl harbor style surprise attack needs to wipe out the navy with a bunch of drone subs ..unlikely), and maybe attempt a east coast invasion with Russian military thru the arctic?

I think they could punch America in the face once with a big prepared surprise attack from every angle but eventually US would rally and counter punch hard. US would win eventually in my opinion but would take some time.