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\"Horizon: An American Saga,\" directed and co-written by Costner, is a two-part western epic which chronicles \"the Civil War expansion and settlement of the American West,\" according to an official description.

Starring alongside Costner in the films are Sienna Miller, Sam Worthington, Jena Malone and others.

The first part of \"Horizon: An American Saga\" arrives June 28 and the second installment releases Aug. 16.

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