 The Italian Socialist Party constantly increased in strength, challenging the traditional liberal and conservative establishment.Starting from the last two decades of the 19th century, Italy developed into a colonial power by forcing under its rule Eritrea and Somalia in East Africa, Tripolitania and Cyrenaica in North Africa (later unified in the colony of Libya) and the Dodecanese islands.From 2 November 1899 to 7 September 1901, Italy also participated as part of the Eight-Nation Alliance forces during the Boxer Rebellion in China; on 7 September 1901, a concession in Tientsin was ceded to the country, and on 7 June 1902, the concession was taken into Italian possession and administered by a consul.