It is true what the others have said about Will wanting to show dominance and trying to provide an efficient method for containing local riots and punishment issues but what I was led to believe was that because of the size of his army after the battle of Hastings was small compared to neighbouring countries army. Will had to find a fast, cost effective and defencive form of protection from the vast hordes eager to take England whilst her guard was down. His answer ... castles cheaper than paying for a bigger army as he could easily force Saxons to do it for free and he wouldn't need to pay foreigners for their raw materials because England had and still has everything it needs to make a lovely castle.
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I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.