Looks pretty good to me, far better then tech 10 natives in 1750s.
If there's one problem I have with this map, it's that it's the reverse of history - Historically, China, Japan were the hardest to defeat and rule, hence why they were never colonized. While they had bad military tech compared with Europe at this point, their large populations, large wealth, powerful institutions and factions, strong national and cultural sentiments meant that European rule would have been extremely difficult, and prone with rebellion, and not something the Europeans actually attempted. It took 8 countries to subdue the Boxer revolution, which wasn't even fully supported by the official Chinese army, and overall it was a very bloody affair that the Europeans couldn't hold ground, and just burned palaces, much like the British in 1812.
With it's long history of education, system of schooling and exams, and culture of book and learning, you would think China would be the first to westernize. (and in reality, no one really westernized, besides Japan). Kongo tribes were not in a strong position to westernize, nor the Indian tribes that tried to model itself on the USA - getting a bunch of guns doesn't equal westernization. In many ways, the Indian Confederations still had hundreds of years of culture still to catch up on - a merchant class, banking, various trade skills, forging, metalworking, writing system, books, military ranks, police, fire fighting, tax assessment, road system, forts - none of this existed, and this is tech that any civilized area had for two thousand years. Getting a bunch of horses and guns from the Europeans and declaring themselves "modern" before quickly being wiped out by the US military is not really all that amazing, but somehow we'd like to think of them as on the cusp of modernity, tech level 25, only a few techs behind Europe and clearly well ahead of China/Japan.
Westernization seems to put all of the world at the level of Europeans with the press of a button, forgetting that uncivilized areas lacked the institutions and cultural habits that civilized areas take for granted (like schools!), and getting a bunch of guns won't make those institutions magically appear.