The term "Russian Empires" refers to the historical periods when Russia expanded its territory and influence, particularly from the 16th century to the early 20th century. The first major empire was established under the rule of the Tsardom of Russia, which later evolved into the Russian Empire in 1721. This empire became one of the largest in history, stretching across Europe, Asia, and North America. The Russian Empire was characterized by a diverse population and a complex social structure. It played a significant role in global politics, culture, and economics until its collapse in 1917 during the Russian Revolution. This led to the establishment of the Soviet Union, marking a new chapter in Russian history.