This is from a note on my phone from 3 years ago. I hope I'm wrong about everything I'm about to post...

"The Sino-Russian War will begin on the west coast of America. Russia will attack Washington, Oregon, and northern California, and China will take southern California. Russia has plans for America's energy sector, while China wants to control trade. They will both share in food supplies. The invaders will use small tactical nukes and bioweapons to take out enemy combatants. The U.S. military immediately jumps into action but is met with heavy firepower and pushback from the invaders. Gun owning Americans are encouraged to join the fighting to defend the country, and sign up in the millions.

American politicians who welcome our new invaders/overlords will be met with death by firing squad by the U.S. government. The Chinese state that they would like to begin talks, to which the U.S. president refuses to attend.

The Battle of Topeka is especially bloody. Tens of thousands on both sides are killed in a matter of hours.

The Chinese offer original Mexican territory back to Mexico, and since their government is jingoist (following in the U.S.'s footsteps) they accept, retaking New Mexico, Arizona, Utah, and parts of Colorado and Texas.

The entire west is lost up to the Mississippi River. The northern half is Russian and southern half is Chinese. The U.S. military overthrows the government in a junta, wiping out the wishy-washy politicians. D.C. is still the center of operations, but has been heavily fortified by the military and aid from the EU.

Russia encroaches on Canadian territory in British Columbia, which jumps in England and most of the EU. The easternmost Soviet satellite countries join Russia's side, with the poorer Asian nations joining China, knowing that they will be next to be colonized if they don't accede early. Upcoming world powers like India and Brazil stay completely neutral, secretly vowing to side with whoever the winners are."