In 1914, 38% of the world either lived in Europe or had European ancestry (living in the Western hemisphere, Australia, South Africa, Russian Far-East etc). 38 million would die, mostly from Europe. Another 70 million would die in WW2. Millions more in the holocaust and Communist purges. France lost a quarter of its young men in WW1 alone.
Avoid WW1 and have a peaceful 20th century. Europe will be filled to the brim with people. By 1950 ATL, millions will need to migrate. We are talking 300-500 million extra people. The United States had strict immigrant laws and quotas until 1965, so other locations are needed.
Italians flood to Libya. The French flood into Algeria, Morocco, and Tunisia. The British flood to Canada, Australia, New Zealand, and South Africa (these countries get large numbers from all European countries). The Dutch flood into South Africa. Kenya get smaller but significant numbers of British immigrants. The Germans flood into Namibia and Tanzania.Millions of Jews and Russians would flood Palestine.
You have the potential for several white majority or south African demographics like countries all over Africa.
Assuming with a large increase of the white population, plus no WW1, the Europeans keep their colonies and form federations with them. This would allow easy movement from one part of the Empire to another. I can see many Indians coming from India for cheap labor to work the mines and farms, but later settleing.
Assuming the Ottomans still collsepse as OTL and the British and French carve out the Middle East, then Arabs would get the chance to work and sell in Africa.
What about this?