Test By facebooker_6861551180572514 Period: 31 to 476 Imperial Rome Period: 286 to 1461 Byzantine Empire Period: 882 to 1240 Kievan Rus' Period: 1547 to 1721 Tsardom of Muscovy Period: 1721 to 1917 Russian Empire Period: 1776 to 2023 USA Period: 1917 to 1991 Soviet Union Period: 1991 to 2023 Ukraine