I think it’s C. Louisiana Purchase
<span>It confirmed that students at school had freedom of speech.
The case revolves around the constituinal rights that held by the public schools' students in united states.
The case ruled that students are granted to exercise the right to form a protest/voice up their opinion as long as it's done peacfully.</span>
Answer:
Bloody Sunday made the country aware of civil rights for the first time
Explanation: