

There’s an incredibly good history of the Chinese warlord era that leads up to this 1931-1937 period, Beiyang Junfa Shi, ‘History of the Beiyang Warlords’. Was written by a guy who studied the archives for half a century. Idk if it’s available in english though.
edit: found it on Anna’s but it’s in Chinese. I’m sure there’s plenty of translation software that might work, although it is quite a long read, so I wouldn’t go too much into it unless you’re really interested in this topic. https://annas-archive.org/md5/049b77615925905ac7790b909cbed0c2

That’s a… pretty interesting claim, since at this stage China and the US are basically on equal footing, and we’ve already seen that China has done ample preparing for a potential trade war, with them basically being unaffected. If any side is the desperate one, it’s the US.