<a href="https://en.wikipedia.org/wiki/Vietnam_War" id="mw_w" rel="mw:WikiLink" title="Vietnam War">Vietnam War</a>: <a href="https://en.wikipedia.org/wiki/Kent_State_shootings" id="mwAQA" rel="mw:WikiLink" title="Kent State shootings">Kent State shootings</a>: The <a href="https://en.wikipedia.org/wiki/Ohio_National_Guard" id="mwAQE" rel="mw:WikiLink" title="Ohio National Guard">Ohio National Guard</a>, sent to <a href="https://en.wikipedia.org/wiki/Kent_State_University" id="mwAQI" rel="mw:WikiLink" title="Kent State University">Kent State University</a> after disturbances in the city of Kent the weekend before, opens fire killing four unarmed students and wounding nine others. The students were protesting the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Cambodian_Campaign" id="mwAQM" rel="mw:WikiLink" title="Cambodian Campaign">Cambodian Campaign</a> of the United States and <a href="https://en.wikipedia.org/wiki/South_Vietnam" id="mwAQQ" rel="mw:WikiLink" title="South Vietnam">South Vietnam</a>.