Big picture TLDR…
What the CCP is trying to do here, we were or will be successful there.
They were going to try to starve the American farmer by cutting Ag trade. So POTUS made it part of the trade agreement to force their hand.
POTUS put them in a position that if they bought our Ag products, it cost them in the political war because it meant he won publicly on trade. But he killed their ability to starve farmers by use of the tariff, so it didn't matter what China did. Remember how severely the Chinese ran media here screamed about it?
Then remember 1/2 of China's pigs dying? There are no coincidences. The timing was on purpose and related to the course of action China took.
"Qiu Huaji, a leading Chinese expert on porcine infectious diseases, has said that African swine fever has been no less devastating "than a war" – in terms of "its effects on the national interest and people's livelihoods and its political, economic and social impact."
https://www.nytimes.com/2020/01/01/opinion/china-swine-fever.html
If they bent the knee to trade, Trump won the trade war publicly which would bolster his political position and economic position of the US. So they couldn't. If they didn't buy, they were screwing their own country over because their is only so much resources available and they are a black hole that consumes so much of it.
I believe POTUS knew China would pull out of the trade deal…. it weakened China and gave US the opportunity to exploit it with an attack on their agriculture industry.
A hungry or poor populace is an unhappy populace. And an unhappy populace is more likely to join an uprising.
What China is trying to do here, we are doing there. They wanted to harm our agriculture industry. We decimated theirs.
They want us in a civil war to over throw us. I think the CCP's days are very numbered and the Chinese people will overthrow them before long. Our core is united, by far more so today than 4 years ago. China's populace is held together by oppression and force. Ours by love of country and Creator.
They wanted to surround us by using Canada and South America. We have them surrounded by use of India, Taiwan, Japan, Korea (I think both). China can't unload their country to invade here because India is itching for them to be stupid and has the numbers to match, with US tech/support. India wants some of the manufacturing relationship with the US that China is losing. And the CCP is a danger to India evidenced by border disputes.
The CCP can't survive a major conflict. There are too many factions in the Chinese people wanting to overthrow the CCP, and looking for a real opportunity to do it.
China is getting weaker daily with the current world wide exposure.