What concepts are described in the following sentence?

"The 14th New Jersey Volunteer Infantry monument which belongs to the category of historic districts in the United States, was established on 11 July 1907 within the Monocacy National Battlefield in Frederick County Maryland. The nearest city to the battlefield is Frederick."

Return the answer as pairs of triples.
Monocacy National Battlefield LOCATION Frederick County, Maryland
14th New Jersey Volunteer Infantry Monument ESTABLISHED "1907-07-11"
14th New Jersey Volunteer Infantry Monument CATEGORY Historic districts in the United States
14th New Jersey Volunteer Infantry Monument DISTRICT Monocacy National Battlefield
Monocacy National Battlefield NEAREST_CITY Frederick, Maryland