Answer:
The Building of Tenochtitlan About 1325, the Aztecs began building a capital city on the island in Lake Texcoco. They called the new capital Tenochtitlan (tay»nohch«teet»LAHN). In some ways the place said to be chosen by Huitzilopochtli was a good one. Having water all around made the island city easy to defend against attack.
Explanation:
Concurring opinion is when one or more agree
unanimous opinion is when means almost everyone (or everyone) agrees
i.e:
you have to get a box into the house
out of 5 people, 1 person thinks you should hire someone to do it; that's a concurring opinion
out of 5 people, all 5 think you should just carry it into your house, that's a unanimous opinion
From Europeans because the Europeans brought slaves from Africa to sell to America
The British Parliament passes the Tea Act, a bill designed to save the faltering East India Company from bankruptcy by greatly lowering the tea tax it paid to the British government and, thus, granting it a de facto monopoly on the American tea trade.
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.