Many of us weren't born yet, but those who were, see 1968 was a pivotal year in US history. The 1968 Exhibit. Everything you wanted to know about 1968 but were afraid to ask.
On June 15th, 1920 in Duluth, Minnesota, three young, black circus workers, Elias Clayton, Elmer Jackson and Issac McGhie, were lynched. The Minnesota Historical Society has a great site devoted to the terrible event, Duluth Lynchings Online Resource. I'd especially like to point out the Oral Histories section, which has short interviews with African-Americans who lived through the event. In 2001 Minnesota Public Radio covered the story, inspired by a campaign to build a memorial to the three men, which was dedicated in October of 2003. The Clayton Jackson McGhie Memorial has a fine website which is well worth visiting.