Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: American Westward expansion | Statement: [End of the Oregon Trail Interpretive Center, theme, American Westward expansion]

Target entity: American Westward expansion
Context triple: [End of the Oregon Trail Interpretive Center, theme, American Westward expansion]

• A. United States territorial expansion chosen
  United States territorial expansion refers to the historical process by which the United States grew from a cluster of Atlantic coast colonies into a transcontinental nation through purchases, wars, treaties, and settlement.
• B. WesternDevelopmentStrategy
  WesternDevelopmentStrategy is a long-term Chinese government initiative aimed at accelerating economic growth and reducing regional disparities in the country’s western and inland provinces through large-scale investment and policy support.
• C. Oregon territorial period
  The Oregon territorial period was the era from 1848 to 1859 when the region that would become the state of Oregon was governed as a U.S. territory with its own appointed and elected officials.
• D. In the American West
  "In the American West" is a landmark photographic series and book by Richard Avedon that presents stark, large-format portraits of everyday people from the western United States, challenging romanticized myths of the region.
• E. frontier thesis
  The frontier thesis is a theory proposed by historian Frederick Jackson Turner that argues the American frontier experience fundamentally shaped the nation’s democracy, culture, and identity.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.