 Complete the following phrase:  The militarist and nationalistic reign of Czar Nicholas I 18251855 led to wars of conquest against Persia 18261828 and Turkey 18281829. Various rebel tribes in the Caucasus region were crushed. A Polish revolt in 1830 was ruthlessly crushed. Russian troops in 1848 crossed into Austria-Hungary to put down the Hungarian Revolt. Russification policies were implemented to weaken minority ethnic groups. Nicholas also built the Kremlin Palace and a new cathedral in Saint Petersburg, and Pan-Slavist ambition led to further war with Turkey the sick man of Europe in 1853 provoked Britain and France 