The correct answer is C) Citations.
A citation is when an author gives credit to an individual for a quote, picture, or some other type of information. Reliable sources include citations because it allows the reader to look into the sources the author used in order to create their book. If the person looks into the resources used and they are not from accredited or peer reviewed works, it will discredit the author's argument.
This is especially true in the field of history. The most reliable sources are ones that contain several citations and have been peer reviewed by other professionals within the same field.
What did the Louisiana Purchase achieve for the United States?<span>
With the Louisiana Purchase in 1803, the United States purchased approximately 828,000,000 square miles of territory from France, thereby doubling the size of the young republic.</span>
There are several reasons experts believe the city of Cahokia disappeared such as:
- It grew too large
- Sanitary system wasn't good and people got sick.
- Inhabitants destroyed the nearby forests to get firewood and without the wood, their city couldn't survive.
- Enemies attacked.
Cahokia was a thriving city that was quite prosperous with their main food being maize which the fair climate allowed them to grow.
Overtime this changed and a drought that lasted for centuries kicked in. It led to conflict and strife in the large settlement as people could not get enough food.
Experts also believe that other problems such as poor sanitation systems and enemies attacking may have also contributed to the inhabitants leaving.
In conclusion, Cahokia was large and thriving but faced many challenges that in the end led to it collapsing.
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These advances in the history of technology stimulated societies to adopt new ways of living and governance.
I don't know what are your answer choices, but Rock The Vote is an organization that encourages just that. :-)