I'm pretty sure only 1 or maybe 2 years.
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The answer would be B) These inventions led to increased business productivity and economic growth
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Answer:
The establishment of three U.S. army forts along the Bozeman trail through Lakota annexed Crow Indian treaty territory caused Red Cloud's war. The Crows fought back against the Indian trespassers by helping the troops in the very same forts that Red Cloud wanted closed.
Explanation:
I’m pretty sure it’s B but I could be wrong
I hope this is helpful but sorry if it isn’t
It ended in february 1917 because in the book it said that in 1917 the revolution became to a break point