Answer:
Feudalism started in the 5th century
Explanation:
More than half of the immigrants entering the united states were from eastern and southern Europe.<span />
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.