Well there were what, 55 countries in the world in 1900 and 25 or so without microstates or the Americas? So without World War I - the world map likely looks very different as colonization likely never ended, German is a major language of science and trade, social reforms and civil rights are way behind OTL, and technology is likely farther ahead in some places while farther behind in others (probably very limited or maybe no nuclear technology and limited computers but biotech and chemistry might be way ahead).