When did the caste system evolve into a four tiered hierarchy?A.) when the Aryans ruled over the region - They arrived in 1500BC and developed the grouping of people based on their status and activities in life.
Towns grew along the canal route, shipping costs between the great lakes and new york were cut to a tenth, and then the second and third choices as well.
Answer:
well, is there like a article or paragraph to help me answer or do we just a-n-s-w-e-r because i don't know
Information in the link below:
https://www.history.com/this-day-in-history/germany-resumes-unrestricted-submarine-warfare