Proofreading Task #2: "Native Americans & Horses" Identify and correct 11 total grammar, spelling, and/or punctuation errors in the passage,

The first horses lived 4 million years ago in North America. From there, they crossed a
Land bridge into Asia and Europe. The horses in Europe and Asia continued to thrive,
but the horses in North America went extinct. No one is quiet sure why they died out
but scientists think it might be because of climate change or overhunting by early
humans.
Because horses had been extinct for so long, Native Americans did not know what
horses were until they were bringed over by the Spanish. When the conquistadors
first came to South America, people thought that the horses were giant dogs. Later,
in 1680, Pueblo Native Americans fought the Spanish and pushed him out of new
Mexico. Afterwards, the Pueblo were able to use and trade horses. These horses
spread up the western part of what is now the United States, changing the lives of
the people there.
The Native Americans on the western Great Plains captured and trained the Spanish
horses that were running through the Great Plains in wild herds. On horseback,
Native Americans were able to move quick over long distances. This made it easier to
hunt bison, trading, and expand their territory. Not only were the bison a source of
food, and they could also be used to create buffalo robes. Native Americans could
trade these robes with the white settlers for goods, like blankets and guns, Horses
also made life easyer for women. Before, women had to carry their families
possessions from camp to camp. Now, horses could take that load. By mastering the
art of horse riding, tribes were able to gain great power and wealth. One of the most
powerful tribes were the Comanche, who lived in the southern Great Plains.