If you want to do the essay on the Roman Empire, here are some sources to get you started. I've tried to give a good balance of primary and secondary sources:
For the linguistic homogenization of Western Europe: “Ad Infinitum: A biography of Latin,” by Nicholas Ostler is perhaps the best, most readable history of the language I have found.
For Gaul: I can’t think of any primary sources off hand, but for secondary sources, “Becoming Roman: The Origins of Provincial Civilization in Gaul,” by Greg Woolf. I haven’t read it yet, so I can’t vouch for it, but it’s on my list to read, and it looks promising. The bibliography would also probably give you good primary sources.
If you want to focus on North Africa: I would just pour over St. Augustine. His sermons and even some of his larger works are filled with details about the culture of the region.
For the Late Empire: A.H.M. Jones, in his “The Later Roman Empire,” is perhaps the greatest social and economic historian of the Late Roman era. The work is pretty dense and I recommend you make good use of the index, but it is packed with info.
General stuff:
Tactius, particularly the Agricola and to a lesser extant Germania, provides some great sources, giving a Roman’s sharp critique of his own civilizations’ displacement of other cultures.
As for general secondary sources:
“Globalizing Roman Culture: Unity, Diversity and Empire” by Richard Hingley
“Cultural Identity in the Roman Empire” by Dr Joanne Berry
There are many more sources, but this is a start. Just let me know if you want more.
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