The U.S. Democratic Party's National Convention opened in Chicago, sparking four days of clashes (pictured) between anti-Vietnam War protesters and police.

The Democratic Party is a center-left political party in the United States. One of the major parties of the U.S., it was founded in 1828, making it the world's oldest active political party. Its main rival since the 1850s has been the right-wing Republican Party, and the two have since dominated American politics.

The 1968 Democratic National Convention was held August 26–29 at the International Amphitheatre in Chicago, Illinois, United States. Earlier that year incumbent President Lyndon B. Johnson had announced he would not seek reelection, thus making the purpose of the convention to select a new presidential nominee for the Democratic Party. Vice President Hubert Humphrey and Senator Edmund Muskie of Maine were nominated for president and vice president, respectively.

The 1968 Democratic National Convention protests were a series of protests against the United States' involvement in the Vietnam War that took place prior to and during the 1968 Democratic National Convention in Chicago, Illinois. The protests lasted approximately seven days, from August 23 to August 29, 1968, and drew an estimated 7,000 to 10,000 anti-war protesters in total.

Opposition to United States involvement in the Vietnam War began in 1965 with demonstrations against the escalating role of the United States in the war. Over the next several years, these demonstrations grew into a social movement which was incorporated into the broader counterculture of the 1960s.