I didn't see one, so I figured I'd start one. If there's one which has fallen off the page feel free to merge.
Accomplished during 3.0.2. Cherokee and Java have it easy as far as uncivs go, mind you, because as vassals start with the same techs as their overlords, they can rush state and government. (So does... Mughalistan, I'd imagine, although they're even more geographically constrained than Cherokee.)
Colonized Oklahoma, rushed prestige techs to become a GP, expanded into Central America after sphering Mexico. Through a mix of immigration, early NF-based industrialization and hyperteching, punched far above my weight population-wise. Just kicked Mexico out and conquered them, because I needed a higher population to compete with the industrializing Great Powers - had dropped to #7-8 before the war, and conquering them brought me back up to #5 and more than doubled my population, although I'm still behind everyone else. It's been a fun game so far.