Before It Became History | The Treaty of Guadalupe Hidalgo: How One Signature Redrew a Nation

Sandra Day O'Connor Institute · Sep 18, 2026 · 6m

In 1848, a single treaty ended a war, handed the U.S. half of Mexico's land, and promised citizenship rights that weren't kept. Join us as we unpack the Treaty of Guadalupe Hidalgo — the deal that redrew America's borders and its future.

Before It Became History, a podcast series from the Sandra Day O’Connor Institute, explores the people and moments that shaped the American story. Each episode looks beyond the legend to examine the decisions, conflicts, and ideas that tested the promise of liberty and helped define our democracy.

This is history before it hardened into memory — and a…