On January 24, 1859, the historic act of political unity between Moldavia and Wallachia under one single rule, that of Alexandru Ioan Cuza, turned a centuries old dream into real fact. The age of the Union featured a vast and comprehensive reform program relating to institutions, economy, and education. In February 1866, Cuza was obliged to renounce the throne in favor of the German Prince Carol of Hohenzollern-Sigmaringen.The new Constitution (inspired from the Belgian one of 1831), which was promulgated in 1866 and was in use until 1923, proclaimed Romania a constitutional monarchy. In the next decade the struggle of the Romanians to achieve full state independence was part of the movements that took place with other peoples in the south-east of Europe - Serbs, Hungarians, Montenegrins, Bulgarians, Albanians - to cut off their last ties to the Ottoman Empire.
Within a favorable international framework, on May 9 1877, the Assembly of Deputies, synthesizing the aspirations of the Romanian people, proclaimed independence, with foreign minister Mihail Kogalniceanu making the decision known to the world.
The government led by Ion C. Bratianu decided, upon the Russian request for assistance, to join the Russian forces that were operative in Bulgaria. A Romanian army, under the personal command of Prince Carol I, crossed the Danube and participated in the siege of Pleven; the result was the surrender of the Ottoman army led by Osman Pasha (December 10, 1877).
The San Stefano and Berlin treaties (1878) sanctioned the independence of Romania, later acknowledged by the European powers. These international documents re-established Romania's rights over Dobrogea, which was reunited with Romania.
Once Turkish control had been removed, Romania was able to organize its state administration on a modern basis. On 14/26 March, 1881 , the parliament voted a new form of government, the kingdom, with ruling Prince Carol and his wife - Elisabeth of Wied -, being crowned King and Queen of Romania (10th/22nd May, 1881). The king was given a crown made of steel from cannon seized at Pleven from the Turks. As an independent state, Romania started to foster an economic policy directed toward increasing production. Independent Romania furthered a policy which allowed it to play an important role in the concert of European nations.
The 1878-1914 period was crucial in the history of the Romanians. The economy expanded; politics polarized around two parties - conservative and liberal. In 1883, Romania joined the alliance with Germany, Austria-Hungary and Italy. One of the reasons for this choice can be related to its strained relations with Russia after the decision of the Tsarist government in 1878 to occupy Southern Basarabia.
At the end of the 19th and the beginning of the 20th centuries, Romania recorded an outstanding development of culture and science, which matched European standards. It was the time when great scientists like doctors Victor Babes, Gheorghe Marinescu and Constantin Levaditi, chemists Petru Poni and Constantin Istrati, mathematicians Spiru Haret and Traian Lalescu, historians Alexandru D. Xenopol, Dimitrie Onciul and Nicolae Iorga, and linguists Bogdan Petriceicu Hasdeu, Alexandru Cihac, Lazar Saineanu, Sextil Puscariu, came to the fore.
