Ecuadorian–Peruvian War (1857–1860)
The First Ecuadorian–Peruvian War took place between 1857 and 1860. The conflict began when Ecuador attempted to sell Amazon basin land claimed by Peru in order to settle a debt with British creditors.
Source: Wikipedia — Ecuadorian–Peruvian War (1857–1860) (CC BY-SA 4.0)