English is the most spoken language in North America because it diffused through the process of relocation diffusion.
Before British colonies were established there were indigenous communities all over this continent and each of them spoke their native traditional language.
English, which is now the most spoken language in North America was spread through relocation diffusion. This means people who arrive on the continent (mainly British colonizers) spread their ideas and customs including their language.
Based on this, the English language spread through relocation diffusion as British colonies were established.
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