What is historically significant about this 1879 speech by Chief Joseph?
It is a detailed description of the conflict between the non-native settlers and the Native Americans.
It is a direct and eloquent plea delivered in Washington for the equal treatment of all Native Americans.
It is a subtle and polite a
ttempt to make peace with those who work for the government.
It is an adamant demand of requirements issued by the Native Americans to the non-native settlers.

The historical significance that has been demonstrated by Chief Joseph in the given excerpt would be:

B)., It is a direct and eloquent plea delivered in Washington for the equal treatment of all Native Americans.

Thus, option B is the correct answer.

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It is a direct and eloquent plea delivered in Washington for the equal treatment of all Native Americans.

Explanation:

Chief Joseph was a Native American who belonged to a tribe in the Pacific Northwest region of the U.S.A. He fought for his people and their ancestral lands against the white settlers. But later on, he surrendered and was moved to the state of Washington.

In Washington D.C., he delivered his speech at the Lincoln Memorial Hall asking for the equal treatment of all Native Americans, just as the white people are being treated. He just wanted the Native Americans to be treated just as the rest of the men were treated with the freedom to travel, trade, work, shop, etc. as long as they obey the law.

So, this explains the answer.

c. to depict the cunningness of the federal soldiers

i think the answer is b