United Armenia in the context of "First Republic of Armenia"

Western Armenia (Western Armenian: Արեւմտեան Հայաստան, Arevmdian Hayasdan) is a term to refer to the western parts of the Armenian highlands located within Turkey (formerly the Ottoman Empire) that comprise the historical homeland of the Armenians. Western Armenia, also referred to as Byzantine Armenia, emerged following the division of Greater Armenia between the Byzantine Empire (Western Armenia) and Sassanid Persia (Eastern Armenia) in AD 387.

The area was contested during the Ottoman–Persian Wars and was conquered by the Ottoman Empire during the wars of 1532–1555 and 1623–1639. The area then became known also as "Turkish Armenia" or "Ottoman Armenia", and included six vilayets. During the 19th century, the Russian Empire conquered sections of Western Armenia, including Kars.

Armenian Secret Army for the Liberation of Armenia (ASALA) was a militant organization active between 1975 and the 1990s whose stated goal was "to compel the Turkish Government to acknowledge publicly its responsibility for the Armenian genocide in 1915, pay reparations, and cede territory for an Armenian homeland." ASALA itself and other sources described it as a guerilla and armed organization. Some sources, including the United States Department of State, as well as the Ministry of Foreign Affairs of Azerbaijan listed it as a terrorist organization.

The principal goal of ASALA was to establish a United Armenia that would include the formerly Armenian-inhabited six vilayets of the Ottoman Empire (Western Armenia) and Soviet Armenia. The group sought to claim the area (called Wilsonian Armenia) that was promised to the Armenians by American President Woodrow Wilson in the 1920 Treaty of Sèvres, following the Armenian genocide, during which Ottoman Turks murdered 1.5 million Armenians, which Turkey openly denies.

Armenian nationalism in the modern period has its roots in the romantic nationalism of Mikayel Chamchian (1738–1823) and generally defined as the creation of a free, independent and united Armenia formulated as the Armenian Cause (Հայ Դատ Hay Dat). Armenian national awakening developed in the 1880s in the context of the general rise of nationalism under the Ottoman Empire. The Russian Armenia followed with significant causes. The Armenian Apostolic Church has been a great defender of Armenian nationalism, with leaders like Khrimian Hayrik who devoted his life to the peasantry. The establishment of modern Armenia (1991) and Armenian social fabric becoming more complex gradually decrease the political influence of Hye Dat and shifted towards a modern Armenian nationalism modeled as a liberal nationalism.