An agricultural timeline with a prehistoric POD, written by twovultures. You can read the latest version (3.0) here.
The TL essentially concerns horses of the Americas not dying out and South American pecaris becoming more suitable to domestication, thus gradually giving rise to different native agricultural practices and civilizations in North, Central and South America.
Current version (3.0): Pecari Rex, Equus Regina: American Domesticates
Earlier versions:
The American Stinky Pig: Or, Not ANOTHER American Domesticates TL!
Small Beasts: Or, American Domesticates 2.0
Spinoff stories: