Final answer:
Great Britain won the most land in North America because of the Treaty of Paris.
Step-by-step explanation:
The European nation that won the most land in North America because of the Treaty of Paris was Great Britain.
Under the Treaty of Paris of 1763, Great Britain was awarded everything east of the Mississippi River, including Spanish Florida. This made Great Britain the uncontested European power in eastern North America.
SEO keywords: Treaty of Paris, European nation, Great Britain