Answer:
The answer is letter a, Paleo-Indians.
Explanation:
The Paleo-Indians were the first migrants in the United States. Their migration happened <u>12,000 years ago</u> at the end of the last Ice Age (Pleistocene glaciation). They are considered to be the ancestors of the Native Americans.
Paleo-Indians- They are also called Paleoamericans. There are several theories regarding their migration. Some claim that they used a land-and-ice-bridge (Beringia land bridge) in order to cross. This bridge was formed between <em>northeastern Siberia and western Alaska. </em>This means that the animals were also able to cross going to the USA. Others claim that they used <em>primitive boats</em> in order to cross the Pacific coast.
The earliest human activity in America is proven by the <em>stone tools </em>that were found. These tools were made of stones and were used to hunt. They served as<u><em> arrowheads and spear points.</em></u>
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<u>Additional Information:</u>
For the other choices, let me explain when they migrated into the USA.
<u>Latin Americans-</u> They migrated into the USA in the 1920s.
<u>Europeans-</u> The United States experienced a huge number of European migrants in the country from 1880 to 1920. The country was deemed to have a good economic opportunity, which is the main reason why people flock to the place. The Europeans had two reasons to migrate: to have a good economic life and to flee from religious persecution. Many Europeans experienced famine in their places, so it greatly affected their economic condition. They were also persecuted by the church. <em><u>They wanted to attain the freedom to express their faith.</u></em> Many of the church leaders also violated or didn't follow the biblical writings.
<u>Spanish- </u>Spain migrated into the USA in the 15th century. Their primary reason was to search for resources such as gold and silver.