The feud between the Montagues and the Capulets is caused by a number of factors. One is simply the fact that the two families are rivals. They are wealthy and powerful, and they are constantly competing for status and influence. Another factor is that the two families have a long history of hatred and distrust. This history includes many years of violence and bloodshed, which has only served to deepen the divide between the two families.
The feud between the Montagues and the Capulets is a destructive force that affects the entire community. It leads to violence, hatred, and mistrust. It also prevents people from forming relationships with each other, as Romeo and Juliet discover. The feud is ultimately a tragedy, as it leads to the deaths of two young people who could have had a happy and fulfilling life together if only their families had not been at war with each other.