It was only after that people started gathering in large groups and formed more complex institutions

It was only after the Industrial Revolution that people started gathering in large groups and formed more complex institutions.

Explanation:

texas governor sam houston opposed secession, but was unable to prevent it. in this speech, given prior to lincoln's election, he presents the argument that slavery would be safer within the united states than outside of it. it was a prescient argument, and one held by several other southern leaders.

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