France and the UK are usually at both ends of the historical range for several reasons. Everyone has the same political, philosophical, and ideological symptoms, but their growth and achievement are so. France developed from a country governed by a religiously restricted monarchy, but the UK has a similar element, but it has become a completely different country. For the geographical location of England and its invasion or conquest, isolation seems to have formed its foreign policy to reflect the state of freedom and pure heart, but that is close to deciding everyone's foreign policy I think.
In the last decade of the 18th century, both France and the UK experienced a revolution. In France this is a political revolution against the old order and in the UK this is an economic revolution that changes the way wealth is produced and shared. The British industrial revolution spread to the continent of Europe including France. The French Revolution and the revolution of 1830 and 1848 spread to other European countries. But it did not spread to the UK. France and the United Kingdom are on various paths towards political freedom and democracy. In the UK, the king did not enjoy the power of the French principal. Like Magna Carta, restrictions were imposed on the king's power in the 13th century. Congress imposed further restrictions on him, and he could not raise the tax without his permission.
The last century of the Middle Ages saw the centenary war between England and France. War began in 1337 and King France announced Gusconi's British rule in southern France and claimed that King King of England was the legitimate king of France. It seems possible to first win this war until the British conquer half of France and the French people unite with the farmer's girl. She was captured and executed by the UK, but the French fought in 1453 and won the victory. After the war, France won Normandy except for the city of Calais which it bought in 1558.