Which group of people brought the first horses to New World?

The first horses to the New World were brought by Spanish conquistadors in the 16th century.

Here's a little more detail:

* Christopher Columbus brought a few horses on his second voyage to the Americas in 1493, but these horses did not survive.

* Hernán Cortés brought horses with him when he conquered the Aztec Empire in the early 1500s. These horses were crucial in helping the Spanish conquer the native peoples, as they were unfamiliar with the animals and their advantages in warfare.

* From there, horses spread throughout the Americas through trade, exploration, and ranching practices.