An area would most likely be declared a national park because of its

An area would most likely be declared a national park because of its historic importance or being a natural resource or for the conservation of wild-life species.

Explanation:

Importance of National Parks

National parks are created or established primarily for the conservation of natural resources, wild-life, extinct species or to save prehistoric places and monuments that add value to respective states and countries.

Since ancient times, forests and historic lands are adding benefits to the economy of various countries along with the influential background that attracts numerous tourists to visit.

National parks are the part of the act of conservation of natural resources and places that may symbolize the historical background of the country and becomes a proud-factor for the state and country.

Hence, lands that are on the verge to be destroyed or anyhow getting polluted and eventually perishing, are declared as the National Park and developed by the respective governments of the countries.

The International Union for Conservation of Nature (IUCN), as well as the World Commission on Protected Areas (WCPA), has come up to save and develop the extinction of natural areas and historical landmarks by creating national parks.