Twenty events that changed a nation

I have tried, with some difficulty, to pick the key event of each of the last 20 centuries in the United Kingdom - these had to be events that happened on British soil and had an impact on the whole country.  Notice the key themes of conquest, division and unification.

1^st – Roman invasion of Britain by Emperor Claudius (43)

2^nd – Hadrian’s Wall is built, dividing north from south (122-)

3^rd – Britain divided into two provinces, Britannia Superior and Britannia Inferior, with administrative centres at London and York (214)

4^th – Sustained raids by Picts, Irish, and Saxons. Hadrian's Wall abandoned and military commander Fullofaudes captured or killed (367)

5^th – Saxons begin conquest of Britain (409)

6^th – Mission of Augustine to England (597) begins spread of Christianity

7^th – Synod of Hertford gives the Archbishop of Canterbury authority over the whole of the English Church (672)

8^th – Viking invasions begin – raids on Lindisfarne (793)

9^th – Alfred, King of Wessex, halts Danish advance south in England (871) and counters by expanding his control of Merica

10^th – Unification of England (959) – Edgar becomes King of England, unifying the kingdoms of      Northumbria, Mercia and Wessex. He was crowned in 973

11^th – Norman conquest of England (1066) – William I crowned King of England

12^th – Henry I dies, nominating Matilda his heir, but Stephen claims the throne and becomes King of England (1135) leading to civil war in later years

13^th – King John, still struggling financially after Richard’s expenditure on the Crusades, makes concessions to the English barons by signing the Magna Carta (1215)

14^th – Battle of Bannockburn: Scotland defeats England (1314)

15^th – Battle of Bosworth (1485): Henry Tudor defeats Richard III, effectively ending the Wars of the Roses and reunifying the country, leading to greater stability, particularly financially

16^th – Henry VIII breaks with Rome (1534) leading to the reformation

17^th – English Civil War (1642-1649)

18^th – Sir Robert Walpole becomes the first Prime Minister of the United Kingdom (1721)

19^th – Introduction of railways – First passenger line: Stockton to Darlington (1825)

20^th – First general radio broadcasts (1920) - the age of communication begins