Answer:
1) Romeo and Juliet
2) Catholicism and Protestantism
3) France and Britain
Step-by-step explanation:
1) Romeo and Juliet shows the story of two lovers caught in the crossfire of a family feud. Their two families, for one reason or another have been rivals for generations at the time of the tragety.
2) The Roman Orthodox church has been at odds with all other sects of Christianity since the third century CE to the modern day. Enemies to the orthodoxy have been deemed heretics and persecuted relentlessly for centuries, like the Lutherans, Puritans, and Gnostics, many of which fled to the Americas to escape the persecution. Tensions still exist to this day, President Biden's following of the Catholic faith has been sited in many campaign ads and speeches against him.
3) When the duke of Normandy, William the ####### (fatherless son), conquered Britain and became William the Conqueror, he set fourth the rivalry between the Frankish and British peoples that would only, reluctantly, end in the late 1800s. Normandy left the kingdom and joined France, which soured relations. Over the years, many wars broke out between the two, one even lasting well over a century. The unification of Germany and the loss of the Franco-Prussian war, France and Britain formed an uneasy pact, eventually Russia joined and the secret aliance was called the Triple Entente. the alliance was only held together by necessity and threads but the First and Second World Wars made France, Britain, and the United States of America some of the closest allies to date.