Define the history word illuminate

c. 1500, "to light up, shine on," a back-formation from illumination or else from Latin illuminatus, past participle of illuminare "light up, make light, illuminate." Earlier was enlumyen

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.