Ankara Treaty of Lausanne (1923), the Turkish nationalists replaced the Ottoman Empire with the Republic of Turkey on 29 October 1923. A few days earlier, Ankara had officially replaced Constantinople as the new Turkish capital city, on 13 October 1923. After Ankara became the capital of the newly founded Republic of Turkey, new development divided the city into an old section, called "Ulus", and a new section, called "Yenişehir". Ancient buildings reflecting Roman, Byzantine, and Ottoman history and narrow winding streets mark the old section. The new section, now centered on Kızılay Square, has the trappings of a more modern city:
Ankara in a single direction. Ankara is politically a triple battleground between the ruling conservative Justice and Development Party (AKP), the opposition Kemalist centre-left Republican People's Party (CHP) and the nationalist far-right Nationalist Movement Party (MHP). The province of Ankara is divided into 25 districts. The CHP's key and almost only political stronghold in Ankara lies within the central area of Çankaya, which is the city's most populous district. While the CHP has always gained between 60 and 70% of the vote in Çankaya since 2002, political support elsewhere throughout Ankara is minimal. The high population within Çankaya, as well as