Why do people in Monaco speak French?

Answer 1

People in Monaco speaks French, because Principality of Monaco was once part of France until the rulling family of Grimaldi gained independence over their feud through favours and gains on French court, somewhere in 16th century. In the next centuries they got more tracts of land for their Principality of Monaco that kept its shape till today.

because this country has been take up by France before, so, they can speak french

French is the official language of Monaco. Other major languages are English and Italian. And others that aren't major world languages are Monegasque and Occitan. The ruling Grimaldi family was originally Italian. [1] But Monaco's completely surrounded by France. [2] By treaty, it's to be protected by France in case it needs to be defended. [3] Most of its residents are wealthy. French is more widely used internationally than Italian. [4] Its economy fits smoothly into the French Riviera coastal economy.