Italo-Ethiopian War of 1887–1889 in the context of Undeclared war

Italian Eritrea (Italian: Colonia Eritrea, "Colony of Eritrea") was a colony of the Kingdom of Italy in the territory of present-day Eritrea. The first Italian establishment in the area was the purchase of Assab by the Rubattino Shipping Company in 1869, which came under government control in 1882. Occupation of Massawa in 1885 and the subsequent expansion of territory would gradually engulf the region and in 1889 the Ethiopian Empire recognized the Italian possession in the Treaty of Wuchale. In 1890 the Colony of Eritrea was officially founded.

In 1936 the region was integrated into Italian East Africa as the Eritrea Governorate. This would last until Italy's loss of the region in 1941, during the East African campaign of World War II. Italian Eritrea then came under British military administration, which in 1951 fell under United Nations supervision. In September 1952 it became an autonomous part of Ethiopia, until its independence in 1991.

The Treaty of Wuchale (also spelled Treaty of Ucciale; Italian: Trattato di Uccialli, Amharic: የውጫሌ ውል) was a treaty signed between the Ethiopian Empire and the Kingdom of Italy. The signing parties were King Menelik II of Shewa, acting as Emperor of Ethiopia, and Count Pietro Antonelli representing Italy, on 2 May 1889, established the treaty after the Italian occupation of Eritrea. It was signed in the small Ethiopian town of Wuchale, from which the treaty got its name. The purpose of the treaty was to promote friendship and trade among the two countries. It was a treaty to maintain a positive long-lasting relationship between the two empires. The treaty has twenty articles written in two languages, Amharic and Italian; however, there were marked differences in the Italian and the Amharic versions of the treaty, which created miscommunications between the two countries. Specifically, Article 17 of the treaty was translated and interpreted differently by Ethiopia and Italy. Italy claimed the article imposed a protectorate over Ethiopia, while Ethiopia claimed the article allowed international diplomacy to be conducted through Italy by choice. When Menelik II denounced the treaty in 1893, Italy attempted to forcefully impose the protectorate over Ethiopia in the First Italo-Ethiopian War, which ended with Italy's defeat at the Battle of Adwa and the resulting Treaty of Addis Ababa.