1. The internet
2. The car
3. AI
4. The wheel
5. The Telephone
6. Pens/Pencils- we wouldn’t have many documents without it
7. Currency
8. Harnessing Electricity
9. Languages
10. School
<span>Muslim armies left Spanish land and crops in ruins</span>
Most native american deaths resulted from disease brought from the old world (Europe)
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.
