In addition to the above general platform as compiled by MadnotMad, I would make sure that the many ethnic identities and background be respected, rather than repressed.
The Romans had a vast Empire----they, generally, respected the ethnic identity of those whom they conquered.
The world is richer because there are Bantu (and all the hundreds ethnicities of Africa), Arab, Slovokian, Finnish, English, Inuit, Cree, Mayan, Incan, Australian Aboriginals, Maoris, (the hundreds of ethnicities) of New Guinea, Japanese, Chinese, Mongolian, Uzbek, Circassian, and many, many others.
I wouldn't like going to a Tibetan village----and seeing American billboards.