What's the difference between these two sentences?
"There have been many civilizations throughout history."
"There were many civilizations throughout history."
What's the difference between these two sentences?
"There have been many civilizations throughout history."
"There were many civilizations throughout history."
1) In first case, those civilizations still exist, or, at least, their influences still exist. 2) In second case, those civilizations are all lost and long-gone.