This is a 6th grade informational text about the first inhabitants of the Americas that scientists believe migrated over a land bridge thousands of years ago. While reading, students should cite textual evidence to support analysis of what the text says explicitly as well as inferences drawn from the text. Students should also determine a central idea of the text and how it is conveyed through particular details; provide a summary of the text distinct from personal opinions or judgments, and analyze in detail how a key individual, event, or idea is introduced, illustrated, and elaborated in the text (License: https://creativecommons.org/licenses/by/4.0/).