Why did the British king form an alliance with Burgundy and the French king form an alliance with Scotland in the Hundred Years' War?

First of all, this alliance was formed in the war. In the war, the alliance between Burgundy and Britain made France, which once had an advantage, quickly fall into a huge disadvantage (almost collapse);

Secondly, this alliance is mainly because there are enemies with the same interests. The following are some historical reasons:

1, France and Burgundy-the contradiction between them is deep, and the relationship is the nature of the unified war;

A) Burgundy has always been a semi-independent country, which did not meet the majority in France at that time;

B) Burgundy people had considerable strength at that time, and their military strength was not as good as that of the French army, but it was enough to affect the strength comparison between the two sides;

C) There are contradictions and conflicts between Burgundy and French orthodoxy;

2, Britain and Scotland-there are profound contradictions between them, and this relationship is also the nature of the United War:

A) Starting from the "British Isles": In fact, a British Isle is divided into three parts, with England as the main body, but Scotland and Wales are two super-strong ethnic minorities;

B) In Scotland and Wales, there have been quite a number of independence and rebellion in history. In other words, Britain has fought countless times in the war of reunification alone, and the ethnic contradictions and hatred among them can be imagined;