Why was Constantinople so hard to conquer?

can someone just answer this

ha deadpool ofc

explanation:

depending on what kind of map for example a pltical maps works in many ways this iss how it works it shows the areas and places the democratics and the repbulcicans reside for example if   texas chooses trump for president there a republican state and if   califronia chooses hillary there a democratic state.

this article will give you all the answers you need ; )

hope this has you! : )