Ethiopia and Liberia are the only sub-Saharan African nations which can survive the Scramble for Africa.
It was decreed by God in 1800 that the 19th century would suck for the following nations: Spain, the Ottoman Empire, China and all of Asia outside of Japan, all of Africa
Speaking of the Ottoman Empire, they're lucky to have their OTL borders by 1900. If they do, it'll be right before they get colonised by a bunch of European countries
Greece will go from non-existent in 1800 to becoming the Byzantine Empire by 1900, and the Byzantine Empire will of course be one of the Great Powers of Europe. It will also not be called be Greece, but literally called the Byzantine Empire and style itself as the successor to the original Byzantium, and Europe will treat this as a normal course of affairs.
Spain sucks, period. After getting beat up by Napoleon and their former Latin American colonies, they'll just sit around all century and exist as a country to win easy wars against to take the remaining Spanish colonies
Russian Alaska becoming a thriving, well-populated colony that either successfully revolts away from Russia like the US or otherwise becomes the government in exile once the Soviets take over Russia.
Australia is always the same, unless New Zealand fuses with it.
The only nations which can survive colonialism in East Asia are Japan, China, Thailand, and Persia, and none of these nations are any more successful or developed than in OTL except Japan. Vietnam, Burma, etc. exist only to be colonised. Afghanistan may or may not survive, but it'll just join the British Empire.
The Panama Canal will always be built, and if it isn't, it will be because the Nicaragua Canal was built instead.
Haiti will always be a poor godawful republic, never a not as a poor less godawful republic or a poor godawful monarchy or a not as a poor less godawful monarchy. Obviously a dictatorial republic too. The one exception is if Haiti is given the light of civilization by a good white nation like the United States, the Confederate States, Britain, or France, then it'll end up a prosperous and developed part of that nation (and probably end up majority white). Haiti can never do this on its own.
Some people on this board are describing things as "cliches" which are entirely predictable. Haiti, for example, has an incredibly dire starting point. Race is irrelevant: any society where 95%+ of the population have been used as slaves in non-technical tasks for generations is in a near impossible starting place. The only people with education or administrative experience are going to be (understandably) hated and chased out the country when the inevitable revolt happens, and the rest of the population will not have the skills or wealth to build something from that. If you have a tiny population, you can try to avoid the first by being a tax haven, but when you have a big population that capital is going to be spread far too thinly to have any impact. Oh, and that's before you add-in the fact you get hit by deadly hurricanes fairly regularly too.