During the time of their independence, the majority of the colonial population had come from Great Britain, whether from Scotland, Ireland, England or Wales. But there were several other languages spoken...Delaware was founded by Sweden, New York was fouded by the dutch, and many spanish speaking Floridians and Louisina/Ohio Valley/Quebec peoples speaking french also lived in the territories of the colonies.
However, English was spoken by nearly 85% of all of the American colonists, remember this all occured before the industrial revolution and before the American country attracted unskilled labor forces from other regions because until now the territory was under ENGLISH territorial law so most of those who came in were English and spoke English
If one considers English to be a native language of the U.S. (which could be a point of debate in itself), then Spanish would be the most-spoken foreign language and the dialects of the Chinese language would be the second most-spoken foreign language.
Wales would be the most likely country to hear a Celtic language being spoken.
The languages spoken in Luxembourg are French, German, and Luxemburgish! But the 'main' language, would be Luxemburgish.
The royal court typically spoke the language of the ruling class or the official language of the country. For example, in medieval England, they would have spoken Middle English, while in France, they would have spoken French.
During the Victorian era, English was the primary language spoken in the United Kingdom and its colonies. In addition to English, other languages spoken in the Victorian era would depend on the region or country, with languages such as Spanish, French, German, and Italian being commonly spoken among the aristocracy and educated classes.