The foundations of the castles were dug much, much deeper than they first were.
because the rules were boring....
because it got harder for people to protect their castles so they had to make it harder for others to attack
because weapons destroied them over time
concentric castles
concentric castles didn't change. They were the last castle built
because the English would of be defeated. The Normans built castles better than us
it changed because wood is out of style
Becuase of me
Castles don't attack they defend.
They did this because if anyone in the country protest about the king they can build castles for the protection and for a battle with any other country. They changed over time because some of the stone would get old and rot and also to improve the castles protection.
Because what castles used to be made of were not as strong as they are made of now because they had to develop the structure because the weapons that were used against castles in wars had developed stronger aswell!
Because they discovered new technologies.