What's "For context" here?
"And even though 200,000 years is less than one 20,000th of the history of the planet, it is still a very long time! For context, 200,000 years would represent at least 6,000 generations of your ancestors (your grandparents are only 2 generations from you). 200,000 years is also nearly 1,000 times as long as the United States has been a country."
I don't have any clue to interpret "For context" over there in the second sentence.