How Did We Go From Celtic to Latin?

i study linguistics in college, i lack the impeccable credentials of some of the other guest hosts that have come on the show because i'm not an academic. But what i want to explore is exactly how we went from a celtic pre roman gaul to a latin imperial gaul and a kingdom that speaks a new language called french. How does that happen? Now don't worry, i won't go through the whole history. Again, garry already did that quite thoroughly. And if you enjoyed it as much as i did, then we've all spent a very good time together. So let's get down to the question of passing from celtic to lat