Natural causes of the dust bowl included all of the following except (chose one answer)

a) erosions
b) drought
c) floods
d) light soil

How did the movement of soldiers during world war 1 contribute to the global influenza (flu) pandemic of 1918 to 1919, which killed millions of people

What border separates sonora and chihuahua national border state border physical boundary natural boundary

Which of the following scenarios is an example of a trade sanction