Final answer:
The Democratic National Convention (A) during the summer of 1968 was the political event in Chicago that ended in violence. Mayor Richard Daley's efforts to impose order resulted in a 'police riot' against protesters, with the clashes highlighted on national television.
Step-by-step explanation:
During the summer of 1968, the political event that erupted in violence in Chicago was the Democratic National Convention (A). The city's mayor at the time, Richard Daley, brought in a significant number of law enforcement officers and National Guardsmen to maintain order amidst the large protests against the Vietnam War. The protests and the police response, which resulted in a 'police riot', were indicative of the deep divisions within the country, and within the Democratic Party itself, over the war and issues of civil rights. The demonstrations were complex, with participants advocating for various causes, including an antiwar platform. The scene both inside and outside the convention hall, where delegates debated fiercely and rioting occurred, was broadcast to millions on television, showcasing a nation in turmoil during a pivotal era.