What is important about the progressive dates on the map?

To know the exact dates of when the activities were performedThis is important progressive dates on the map.

The United States continued its expansion decade by decade, demonstrating a long-term commitment to the expansion of territory through whatever means available.

Explanation:

for hobos it was a very hard time most hid on the sides of the railroad tracks causing people to get bulls and get them off sometimes causing in fatal death they couldnt get people to give them money because the   people were also in need of money

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.