In what U. S. state, which was admitted to the Union in 1876, was an "orange apple tree" recently rediscovered after having been thought extinct?

Colorado

Explanation:

Colorado is known as the Centennial state because it was admitted into the United States in 1876, 100 years after the Declaration of Independence.

Recently, an Orange Apple tree was rediscovered in Colorado after many had thought it extinct. The tree fed quite a number of people in the late 1800s when miners were at Pike's Peak in search of gold but waned in importance when red apples became dominant.

In 2019 however, Jude and Addie Schuenemeyer found the tree and confirmed it through DNA testing.