Medieval Russian Fortresses AD 862-1480

Using archaeological evidence and first-hand sources, Konstantin Nossov charts the history of the medieval Russian fortress from its early beginnings until the 14th century.According to Russian legend, in AD 862, the Slav tribes of what is now European Russia invited a number of Scandinavian princes to rule over them. In AD 882, Prince Oleg united these kingdoms as the feudal state of Kievan Rus, by building a series of settlement and border fortifications, including the Zmievy Valy (Snake Ramparts), to protect against foreign invasion. 

The current post is about American history. it is a series of 26 video parts:
they are: 

1.New World Encounters
2. English Settlement
3. Growth and Empire
4. The Coming of Independence
5. A New System of Government
etc...