Answer: over thirty thousand miles
Explanation:
In 1840 it had almost reached three thousand miles
And by 1850 it was more than 90 thousand miles.
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Answer:
The development of devastating new weapons technologies
Explanation:
This is sorta the process of elimination use this answer at your own risk
The words that are missing in the sentence are The Second Great Awakening and moral renewal. The so-called Second Great Awakening is referring to revival of religious during the early nineteenth century, where the preachers are advocating or sharing the message of spiritual and moral renewal to people.