Best answer I know is the group of the extremists is Al Qaeda, although I'm pretty sure that's not what you're looking for.
The Translation is "<span>What event marked the end of prehistory? What is its importance?" and the answer is whenever a culture can write its history down, it is nolonger considered prehistory. :D please brainly!
In case you need it in spanish, here-
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<span>La respuesta es siempre que una cultura puede escribir su historia hacia abajo, ya no se considera la prehistoria. : D por favor con inteligencia!</span>