Participants in the Edinburg workshop gather at the Region 1 Education Service Center on February 5, 2014.

Participants in the Corpus Christi workshop gather at the Region 2 Education Service Center on February 6, 2014.

Participants in the San Antonio workshop gather at the Witte Museum on February 7, 2014.

John L. Larson, professor at Purdue University, served on the faculty of all three "Westward Expansion" workshops.

John L. Larson discusses nineteenth-century innovations in transportation and communications at the San Antonio workshop.

A teacher asks a question after John L. Larson's lecture in Edinburg.

John L. Larson leads teachers in an afternoon workshop in Edinburg.

John L. Larson discusses primary source materials with teachers in Corpus Christi.

Teachers review historical documents with John L. Larson in Edinburg.

Daniel Feller, professor of history and editor/director of The Papers of Andrew Jackson at the University of Tennessee, Knoxville, served on the faculty of all three "Westward Expansion" workshops.

A teacher asks a question after Daniel Feller's lecture in Edinburg.

Daniel Feller discusses Manifest Destiny with teachers.

Daniel Feller discusses primary source materials with Rene Ruiz of Alton Memorial Middle School (left) and Mario Rodriguez of Alton Memorial Junior High.

Daniel Walker Howe, professor of history emeritus at the University of California, Los Angeles, served on the faculty of all three workshops.

Daniel Walker Howe delivers a lecture on the Mexican War at the Corpus Christi workshop.

Daniel Walker Howe discusses the Mexican War with teachers in Edinburg.

Teachers review historical documents with Daniel Walker Howe at the Corpus Christi workshop.

Thomas A. Britten, professor of history at The University of Texas at Brownsville, served on the faculty of the Edinburg and Corpus Christi workshops.

A teacher asks a question after Thomas A. Britten's lecture at the Edinburg workshop.

Thomas A. Britten leads teachers in an afternoon workshop in Edinburg.

Thomas A. Britten discusses the effects of westward expansion on Native Americans with teachers at the Corpus Christi workshop.

Erika Bsumek, associate professor of history at The University of Texas at Austin, speaks about the effects of westward expansion on Native Americans at the San Antonio workshop.

A teacher asks a question after Erika Bsumek's lecture at the San Antonio workshop.

Teachers listen as Erika Bsumek shares primary source materials during an afternoon workshop.

Erika Bsumek discusses primary source materials with teachers.