Densely populated urban societies<span> expect disease to spread more quickly due to simpel fact that stopping the spread of desise by medical help is much harder due to density of population and much lrager human face to face contact in a small area......
</span>
Maurya Empire and Gupta Empire are the most significant but there has been more than that.
Hope this helps!
Answer:
to be honest it hasn't it has only brought problems if slavery was not a thing BLM would not exist and White people would not feel superior
Imposition of quota laws.
