The 19th century term describes the perceived right of Americans to use force or the threat of force to wrest desireable land from the grasp of others.

"Yellowstone to Yosemite with Kevin Costner" follows the actor as he explores the history of former President Theodore Roosevelt's 1903 Yosemite expedition with naturalist and environmental advocate ...

The spirit of the frontier is written into our hearts,” said President Donald Trump in his second inaugural address, on Jan.

Teddy Roosevelt would presumably be pleased. President Trump spoke loudly and swung a big stick in Panama’s direction, and it ...