The evidence that best conveys Squanto's loyalty to the settlers is "never left them till he died."
The fragment describes the relationship of Squanto, a native with the settlers. This describes the actions that Squanto did to help the settlers, such as showing them where to fish, how to farm, and places that could be profitable for them, and that this "help" was given by Squanto until his death.
According to the above, the sentence that best conveys that Squanto was faithful to the colonists is "never left them (settlers) till he died".
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