The same themes apply to people living in very different times and places. (I think)
Well in this period, it is considered the old stone age and for good reason, as this era is characterized by the use of rudimentary chipped stone tools. Basically it was the era when human started using tools that were made from stone. Or in other words, innovated.
Well..as far as i learned from my knowledge the answer would be in the past, the military and the FBI have prevented a number of terrorist attacks.
Secondly, wasn't there suppose to be an option answers for your question ?
USA's independence occurred on this date