When the relative pronoun is the object of a preposition, which is used instead of that, for example,  in which ,  for which ,  about which ,  through which , etc. (please see the third example below): Formal English: This is the man to whom I wanted to speak and whose name I had forgotten.he relative pronoun that can only be used in restrictive clauses. It can also be substituted for who (referring to persons) or which (referring to things) in informal English. Whereas that is often used while speaking, who and which are more common in formal written English.
For other uses, see Yellowstone (disambiguation). Yellowstone National Park is a national park located in the U.S. states of Wyoming, Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone was the first National Park in the U.S. and is also widely held to be the first national park in the world.
Yellowstone National Park, 1872. Though there is some dispute, most people agree that the first U.S. national park was Yellowstone National Park in Wyoming.ellowstone National Park, 1872 is commonly regarded as the world's oldest national park, however, Bogd Khan Uul almost certainly is the oldest, dating back to 1783, when it w â¦ as established by the Mongolian government as an area to be kept off limits to exploitation and to be protected for its beauty and nature..