What was a major factor leading to the erosion of
regional cultural differences in the 1920s?

There were several major factors that led to the erosion of regional cultural differences in the 1920s, but the most significant was the rising wealth of the nation.

Spread knowledge of agriculture to humans around the worldprevented human development of language and other ideaswas not a part of human life until only the last 2,000 yearsencouraged most human groups to maintain a nomadic life