The Texan-Mexican War (Great Rapprochement)

As the major northerly powers were distracted by war, Texas saw a chance for ruthless expansion in to the South. Their soldiers advanced through the towns of Mexico laying waste to all in their path. The poorly trained and equipped Mexican soldiers could do nothing to stop the Texan zeal and their German bought equipment.

War
Millions of Mexicans were brutally murdered, most memorably in the Friday Night Massacre, when Texan fighters slaughtered thousands of protesting Mexicans. The Texans knew they could get away with this because the major powers eyes were concentrating on their very survival rather than apprehended bloody murder.

Aftermath
By 1916, the Mexicans were spent and surrendered unconditiojnally to Texas. Texas occupied a vast swathe of land, almost doubling the total land area.