The United Kingdoms of Italy (Italian: Regno Unito de' Italia) is a nation in the Italic Peninsula, holding more or less the OTL Kingdom of Arelat, Italian city-states and the Kingdom of Dalmatia and Austrian Littoral. It formed when the several Italian city-states started federating together between the IX and XVII Centuries under international pressure. Switzerland joined The United Kingdoms of Italy After the first world war. The German and Austrian lands were ceded to Italy in the congress of Vienna after the first world war.