Your definition of Progressivism in your own words.

Progressivism is a political philosophy in support of social reform. ... In the 21st century, a movement that identifies as progressive is "a social or political movement that aims to represent the interests of ordinary people through political change and the support of government actions".

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

a best description that resulted a division among labor in the early farming communities in their period was there was a change in their society in terms of having social roles to develop and change that led complications and divisions in the society.