Answer:
It changed the number of states needing to ratify the Constitution from 13 to 9
Explanation:
I believe the answer is Barbed Wire.
Befor the inventions of barbed wire, the Cattles are let to roam freely across the plains and the owners are required to pay a lot of cowboys to supervise them so they didn't go missing. Witht he invention of barbed wire, they can keep the cattle in a secure place without supervision.
<span>The scientific revolution in Europe from 1500 to 1800 involved the overthrow of
</span><span>an old entrenched orthodoxy.
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