There were many dark periods in American History. Most people would associate them with various wars...
No volcanic eruption in human history has darkened the entire world. But about 535 AD a volcano at Krakatoa erupted so violently it may have darkened the sky around the world to an extent that it caused famines and threw Europe into the Dark Ages (they are not called the Dark Ages because the sky was dark, rather it was considered to be a period of intellectual darkness).
Yes, Canadian schools are similar to American schools. They mostly differ in the study of history and geography because they focus on Canada's history as opposed to the United States history.
Desert Storm under George H.W. Bush was the quickest war in American history. I believe it was over in 100 hours.
one of these i am not sure witch one though the Quaternary Period the Precambrian time the Phanerozoic Eon the Carboniferous Period
There are dozens and dozens of dinosaur skeletons on display at the American Museum of Natural History, so you will have to be more specific.
Dark Ages
dark age
Being an American during this time is lucky
Ancient Greece had been long before the Dark Ages, so the answer to your question is neither. Sometimes the period between the end of the Trojan War and the beginning of the Classical Period is referred to as the Greek Dark Age.
re-oriented period in american regime
American dances that influenced the philippines
the 18th century
reconstruction
Reconstruction.
1855-1880
reconstrution
The Archaic period is also referred to as the dark ages because we have little to no written record of that time period. The following Classical period is when Greece peaked artistically and intellectually.