If this is for the American Pageant, the correct answer is disease
Ticks
no it wasn't the primary cause for the Enlightment
thermal convection is the primary force that cause the sea floor to spread
There were several things that culminated in the Great Depression. Primary among them are the stock market crash of 1929 and the unequal distribution of wealth.
It was the primary cause of the Mexican American War.
The primary cause of death among tobacco-growing settlers was nicotine poisoning. These settlers ingested too much nicotine, and they got sick and died.
Ticks
homestuck
Geography,,,,,,,,,,,,
*volcanoes Earthquakes and vOlcanoes can cause much damage among an area if it's shaken to pieces.
no it wasn't the primary cause for the Enlightment
The highest incidence of PTSD among active-duty service members after it was recognized as an actual ailment is among clerical personnel located stateside. So reading about it appears to be the primary cause.
The primary cause of weather is the sun!
The primary cause of the Crusades was for the Christians to win back the "Holy Land."
The Native Americans had land. The European Settlers wanted it. That is not just the "most likely" cause, that is the cause.
A primary cause for surface winds on the earth is the Earths Rotation.
The primary cause of destruction of ozone layer is CFC's. They react with ozone to deplete it.