United States History On This Date: May 8th

1846 — The Battle of Palo Alto Begins the U.S.–Mexican War

U.S. and Mexican forces clash north of the Rio Grande in the first major battle of the Mexican‑American War. General Zachary Taylor’s artillery gives the United States a decisive advantage, signaling that the conflict will be longer and more intense than expected. News of the battle reaches Washington quickly, fueling congressional debates over expansion, slavery, and national destiny.

1914 — Congress Establishes Mother’s Day as a National Holiday

President Woodrow Wilson signs a proclamation officially designating the second Sunday in May as Mother’s Day. The holiday, championed by activist Anna Jarvis, reflects growing national interest in family life, civic virtue, and women’s contributions to American society. Its establishment also highlights the era’s expanding role of federal government in shaping national cultural observances.

1942 — The Battle of the Coral Sea Ends

American and Japanese naval forces conclude the Battle of the Coral Sea, the first major naval engagement fought entirely by aircraft launched from carriers. Although both sides suffer heavy losses, the United States prevents Japan from advancing toward Australia. The battle marks a strategic turning point, proving the importance of carrier warfare and setting the stage for Midway.

1973 — The Pentagon Papers Case Reaches a Turning Point

Former Defense Department analyst Daniel Ellsberg surrenders to federal authorities after leaking the Pentagon Papers, a classified study revealing government deception during the Vietnam War. On May 8, a federal judge dismisses key charges due to government misconduct. The case becomes a landmark moment for press freedom, whistleblowing, and public skepticism toward official wartime narratives.

Battle of Palo Alto Mexican-American War, 1846