Settlers arriving in Washington continued to push into Indigenous lands for the following reasons:
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to establish missions - Many settlers aimed to convert Indigenous peoples to Christianity and establish missions as part of their expansion.
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to organize mining operations - The discovery of valuable resources, such as gold and minerals, motivated settlers to encroach on Indigenous lands for mining opportunities.
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to establish farms - Settlers sought fertile land for agriculture, leading them to occupy and cultivate areas traditionally used by Indigenous peoples.
The options "to expand the size of tribal lands" and "to adopt Indigenous traditions" do not accurately reflect the motivations of settlers in this context.