History of Russia
The war ended in 1721 when an exhausted Sweden sued for peace with Russia. Peter acquired four provinces situated south and east of the Gulf of Finland, thus securing his coveted access to the sea. There, in 1703, he had already founded the city that was to become Russia's new capital, Saint Petersburg, as a "window opened upon Europe" to replace Moscow, long Russia's cultural center. Russian intervention in the Commonwealth marked, with the Silent Sejm, the beginning of a 200-year domination of that region by the Russian Empire. In celebration of his conquests, Peter assumed the title of emperor, and the Russian Tsardom officially became the Russian Empire in 1721.
Soviet Union
Modern revolutionary activity in the Russian Empire began with the Decembrist revolt of 1825. Although serfdom was abolished in 1861, it was done on terms unfavorable to the peasants and served to encourage revolutionaries. A parliament—the State Duma—was established in 1906 after the Russian Revolution of 1905, but Tsar Nicholas II resisted attempts to move from absolute to constitutional monarchy. Social unrest continued and was aggravated during World War I by military defeat and food shortages in major cities.