After running dry, the Santa Cruz River in southern Arizona is coming back to life. But restoration still faces challenges.

A joint agreement appeared to avert a threat by President Trump of tariffs and sanctions in a long-running dispute over water ...

Imagine a world where the Americas were not connected—a time when wild Pacific waters crashed against scattered islands, and ...

Central America, with its rich patchwork of cultures, diverse landscapes and abundant wildlife, is a region well worth ...

Smithsonian American Art Museum, Gift of George D. Pratt. The Smithsonian Institution came of age in the era of Manif ...