Task: Question Generation
Input (English): Passage: In the first period, before 1648, we are dealing mostly with raids and defensive measures. Before 1507 raids were into the Polish Ukraine extending as far as Belarus. After 1507 raiding into the Ukraine continued but most raids were in the region south of Moscow. There was a tendency for population, fortifications and raiding to shift south from Moscow and east from the Polish/Ukrainian area. After 1648 we are dealing with large armies - Tatars, Turks, Poles, Russians and large numbers of Ukrainian Cossacks. Most fighting was in the western Ukraine . This drove the Slavic population to the Left Bank and probably allowed Russian population to expand southward north of Ukraine. Fighting weakened the Polish Commonwealth, but Russia continued to grow southward until it annexed Crimea in 1783. Note that this list does not include raids before 1480, raids further east, most Cossack raids on Crimea and petty raiding between different groups of Nogais, which was considerable. The main underlying theme of the period is the southward expansion of Russian population and the eastward expansion of Ukrainian population. If we had population figures for this the history of the period would be much clearer.
Output (English): How many years after raids were well into the Polish Ukraine as far as Belarus did Russia annex Crimea?