Answer:
Atomic weapons
Explanation:
Atomic weapons were not invented yet until much later
Answer:
Cambrian
Explanation:
The earliest ancestors of about half of all extant animal phyla can be traced back to the CAMBRIAN explosion.
They achieved unification in the 19th century!
Answer:
It is the deadliest terrorist attack in human history and the single deadliest incident for firefighters and law enforcement officers in the history of the United States, with 340 and 72 killed, respectively.
Explanation:
Rationing, Propaganda, and then patriotism
