Why did Native American leaders like Black Hawk rebel against the United States during this time?​

Because at the time some of the Native Americans sided with the British.

Explanation:

Most Native American tribes during the War of 1812 sided with British because they wanted to safeguard their tribal lands, and hoped a British victory would relieve the  pressure they were experiencing from U.S. settlers who wanted to push further into Native American lands in southern Canada.

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The Black Hawk War was a conflict between the United States and Native Americans led by Black Hawk, a Sauk leader. ... By the time of the Black Hawk War, the population of the two tribes was about 6,000 people.

Explanation:

your answer would be (a)

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!