Examine Shakespeare's portrayal of history with reference to his historical plays?plz answer in detail

First, it must remembered that Shakespeare was playwright,
NOT a historian.  He used the history plays to make points about war and power.  The end
of the Plantagenet family as the rulers of England was filled with both internal and
external wars, the War of the Roses and The Hundred Years
War.

The cycle begins with Richard II, who by most accounts
was not a very good king.  He came to the throne as a child and never learned how to
rule.  He misused his power and lost his throne as a result to his cousin, Henry IV, who
was never comfortable on the throne since he usurped it.  Henry V followed his father
and became a hero with his victory at Agincourt.  However, he died young and was
succeeded by his infant son, another minority king.  He was a good man but not a very
good king.  After losing in France, Henry VI was forced to fight for his throne at home,
the War of the Roses.  The trilogy ends with Richard III and his defeat at Bosworth
Field and the rise of the Tudors.

In telling his story of
this turbulent history, Shakespeare twisted the history to suit his dramatic purpose.
 For example, at the end of Henry VI, Shakespeare has the young Richard kill the king.
 It is a wonderfully dramatic scene but it didn't happen.  When Henry VI died, Richard
was a young boy living in France.  He did not fight in the war.  Shakespeare aged the
character so he could be established him as a villain.  In reality, Richard III was a
good king and probably had nothing to do with the deaths of the little princes since
they would not have been recognized by the church as the the heirs to the throne due to
a previous marriage arrangement for Edward III. Edward had been pledged to marry another
woman and was still bound to her when he married Elizabeth
Woodville.

It must also be remembered that the Tudors came
to the throne by defeating Richard III, the last Plantagenet king.  It must also be
noted that the Tudor came from an illegitimate line from John of Gaunt.  Elizabeth was a
Tudor.  If Shakespeare knew the truth he was wise enough not to tell it.  For him.
history was a tool he could use to manipulate to tell his story.