How did horses, which were not native to the Americas, first arrive on the continents in the 15th and 16th centuries?

They were brought over by Spanish explorers and colonists.

They migrated from Asia across a frozen land bridge.

They were introduced by English settlers in North America.

They evolved from smaller animals native to the Great Plains.

For Native American groups on the Great Plains, what was a primary advantage of using horses for hunting bison?

Horses were used to build large traps to capture the bison.

The sound of horses scared the bison into staying in one place.

It allowed hunters to travel farther and keep up with the large, fast-moving herds.

Horses provided a better view for spotting bison from far away.

It made battles less common because groups could escape.

It ended most conflicts between different groups entirely.

It led to new peace treaties as groups shared the animals.

It altered the balance of power and increased the intensity of conflicts.