The stamp war
When Bolivia printed a stamp where the area Gran Chaco was a part of the lands territorium, the stamp war between Bolivia and Paraguay started.
Paraguay claimed that Gran Chaco where a part of their country and printed a bigger stamp whit Gran Chaco in their territorium. Both countrys made bigger and bigger stamps. But in 1932, Bolvia declared war and sent soldiers to the area. About 100.000 soliders lost their lifes during the three years the battle lasted untill Paraguay could resign from the war victorius.