I think the world would be more peaceful too. The teachings of cultures before colonialism were mostly of peace and respect. It was views from colonisers that caused the most problems and prejudices between people.i think everyone would've developed slowly but steadily and peacrfully. but i might be wrong, it may be the actual opposite. what i'm sure of though is that, there would've been relatively more peace and stability.
Poverty probably wouldn’t be as widespread either as the now “third world countries” lived relatively stable and happy lives as they had all the resources they needed to survive before their nations were destroyed and left to suffer