The passage reinforces the central idea that the American's thirst for conquest had a racial character and aimed to diminish and dominate the native community.
How can this be perceived?
The passage points how the removal of indigenous communities was problematic.
The passage points out how unhappy the natives were.
The central idea explain how this removal was done due to the ambition of the Americans.
The central idea of the text is to point out how the idea of Manifest Destiny was completely contrary to the ideals that built and formed the USA.
That's because the country was created as a praise of freedom, democracy, and national pride, but it's ignored all those concepts when it adopted the concept of imperialism and began to evade regions to take their riches and abuse indigenous peoples, as the Europeans did with them .
Manifest Destiny provoked the suffering of many group of people through oppressive systems. This is the central idea in the quote by Alexis de Tocqueville, where he show's that the indigenous people were saddened by the forced removal of the American government established as a way of advancing their domains on account of American imperialism.
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