Africa
Once the Scramble for Africa started I agressively eat up the Nigerian minors while having Sokoto, Egypt and Ethiopia sphered. The latter two decided to attack some of my civilians and had to be forcefully subjugated, Sokoto bend their knee willingly. The Somali minors were also eaten. From there I pushed south in the east and connected Nigeria to Egypt. The Belgians got the Congo, but once they inherited the Free State the Portuguese went down hard on them, waging 4 colonial wars against Brussels, in two of which I intervened.
Persia and India
With the dismantling of the UK, India returned largely to local rule. The last remaining pockets of foreign influence are Belgian Ceylon and Bengal, as well as large swath of land adminstered by the Republic of Yugoslavia stretching from Gujarat to Hyderabad.
China
Sitting largely uninterrupted except a few minor European incursions that forced it to surrender some harbours, Qing China had westernized by the 1920s. The strain of modernization however proved to much for the dynasty, and the ancient civilization was once more torn ansuncer by local warlords. The Japanese quickly exploited the situation and established puppet regimes in Manchuria and northern Formosa. In the heartlands, Beijang China and the Nationalists are emerging as the dominant powers.
Indonesia
Big Malaysia emerged from the former British posessions, Java was seized from the Dutch in the First Great War. The Dutch actually failed to establish dominance over the Archipelago, with Java being reelesed by rebels in the 1850s or so and only reconquered by them in the 80s. If I had the Infamy to spare (and I had in retrospect, didn't know the infamy for the Anschluss was reduced to 10) I would have conquered it earlier.
North America
Surprise, the reversed Civil War happened! The Union was permanently torn asunder, but the two Americas each stands as a Great Power in their own right (even if the Free States are way more powerful). And even with the Americans divided, Mexico failed to regain her territories.
South America
Pretty standard. Nothing really ever happens in South America. Peru managed to retake their Chilenean cores and took that one province off Brazil, but failed to conquer Ecuador until some of their cores there were gone.
Germany finished the Panama Canal in 1928, standing as yet another monument to German ingenuity and superior engineering.