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The story of how America became a superpower is the topic of the Minnesota History Center's new exhibit "WW1 America." Original artifacts, multimedia presentation, images and voices of those who lived in the era between 1914 and 1919 are on display. Learn how the United States persevered through the tumultuous times when the display kicks off today with a history talk and theatrical performance with Kevin Kling. Saturday, active military and veterans receive free admission and family activities include interactive stations and costumed re-enactors. (7 p.m. today. $25-$30. Fitzgerald Theater, 10 E. Exchange St., St. Paul; 10 a.m.-5 p.m. Sat. $6-$12. Minnesota History Center, 345 W. Kellogg Blvd., St. Paul. mnhs.org.)