The "no work, no food" rule
I think it’s A.Military Strength
<span>People must be able to share ideas without fear of punishment to participate in civic life. </span>
The election of 1860 is your answer. When the south got word of Lincoln’s election a few states started seceding within days. This led to the soon start of the war.
The massacre at Wounded Knee in 1890 occurred in response to "<span>d. the discovery of gold at Pike’s Peak" since this was the main reason why settlers were there, although this was not exactly a "response". </span>