Answer:
Polk campaigned under the popular slogan "54-40 or fight," a contention that the southern boundary of Russian America was the northern boundary of Oregon
The effect did the use of satellite imagery most likely have on the study of early humans is C.) Historians were able to accurately locate areas where early humans could be found.
<h3>What is satellite imagery used for?</h3>
Satellite images is known to be a tech that is often used in tracking the altering human footprint in all of the globe, such as rapidly growing cities, urban sprawl and others.
Hence, The effect did the use of satellite imagery most likely have on the study of early humans is C.) Historians were able to accurately locate areas where early humans could be found.
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Assuming that you want this simplified...
Use the FOIL method and combine like terms:
And your final answer is: 
8. because they dont want to
9. no significance
10. no promise
