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 Turkish as "Engürü". The form "Angora" is preserved in the names of breeds of many different kinds of animals, and in the names of several locations in the US (see Angora). Ankara has a hot-summer Mediterranean climate (Köppen "Csa") which closely borders a hot summer Mediterranean continental climate (Köppen "Dsa"). Under the Trewartha climate classification, Ankara has a middle latitude steppe climate ("BSk"). Due to its elevation and inland location, Ankara has cold, somewhat snowy winters and hot, dry summers. Rainfall occurs mostly during the spring and autumn. Ankara lies in USDA Hardiness zone 7b, and its annual average precipitation