Which legendary Russian leader is known for unifying large swaths of the country during the 16th century? Select one answer: Vladimir I Ivan the Terrible Peter I Alexei II

The correct answer is Ivan the Terrible. Ivan IV, commonly known as Ivan the Terrible, was the first Tsar of Russia and is known for unifying large swaths of the country during the 16th century. He centralized power and expanded the territory of Russia through military conquests and strategic alliances. Ivan the Terrible's reign marked the beginning of the Tsardom of Russia, which later evolved into the Russian Empire.