How have african-american studies developed in recent decades?

Intensive academic efforts to reconstruct African American history began in the late 19th century (W. E. B. Du Bois, The Suppression of the African Slave Trade to the United States of America, 1896).

Explanation:

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

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