<a class="mw-redirect" href="https://en.wikipedia.org/wiki/American_Civil_Rights_Movement" id="mw4w" rel="mw:WikiLink" title="American Civil Rights Movement">American Civil Rights Movement</a>: <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Little_Rock_Crisis" id="mw5A" rel="mw:WikiLink" title="Little Rock Crisis">Little Rock Crisis</a>: The governor of Arkansas calls out the National Guard to prevent African American students from enrolling in <a href="https://en.wikipedia.org/wiki/Little_Rock_Central_High_School" id="mw5Q" rel="mw:WikiLink" title="Little Rock Central High School">Little Rock Central High School</a>, resulting in the lawsuit <i id="mw5g"><a href="https://en.wikipedia.org/wiki/Cooper_v._Aaron" id="mw5w" rel="mw:WikiLink" title="Cooper v. Aaron">Cooper v. Aaron</a></i> the following year.