With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: The principalities of Wallachia and Moldavia - for centuries under the suzerainty of the Turkish Ottoman Empire - secured their autonomy in 1856 ; they were de~facto linked in 1859 and formally united in 1862 under the new name of Romania .
text_B: 1856 is a geographical/political entity
not-entailed.