A peace treaty ended the Mexican–American War in February 1848 and officially left California as new American territory.

The Battle of the Alamo in 1836 resulted in victory by Mexico, but was soon followed by independence for Texas.

The nine signers of the “Plan of San Diego,” a blueprint for a borderland bloodbath, were charged on Jan. 24, 1915 with conspiracy against the United States government.

Donald Trump is not the first US president to push for territorial expansion. Throughout history, the United States acquired ...

Donald Trump has a painting of Andrew Jackson in the Oval Office, but as he tries to browbeat Denmark into coughing up Greenland, maybe he should add a portrait of a Jackson acolyte — James K. Polk.

Donald Trump is not the first American president to push for territorial expansion. Throughout history, the United States ...

Like Trump, James K. Polk was a cold-eyed American expansionist — but even he compromised with allies to add to US territory.

Flights have been canceled, store shelves have been emptied and roads have been treated in at least 34 states that will be ...

In his new role as assistant director of the White House Office of National Drug Control Policy, Victor Avila emphasizes the cartels’ control and exploitation over individuals and families seeking ...

Mexican Security Minister Omar García Harfuch wrote in a social media post on X that the people transferred were "high impact ...

A photo of Senator Ted Cruz on a plane to Laguna Beach as Texas braces for a winter storm is drawing a lot of attention.

Beginning with the annexation of Texas, which voted to become the 28th state in 1845, Polk aggressively expanded America’s ...