Answer:
people could now buy goods instead of just trade.
Based on the statistics by McGrady, the condition of American economy was really very worrying.
<h3>Who is McGrady?</h3>
McGrady is one of the loyalist, who was American former professional basketball player, that speak about the condition of the economy in US.
He gave a statistics that almost 11,000,000 people don't have a job which is worrisome.
Learn more about Lamar McGrady at
brainly.com/question/11352260
Very early societies did not have a written language or even ways to efficienly preserve information, so we can reject the options "maps" and "written records".
As far as the other two options go - ice core samples and tree rings, both are correct! probably "ice core" samples are the better answer, since only fossilized tree rings would tell us about the very early societies.
