You're still wrong. It's true that evidence of cities and such goes back only 6-10 thousand years. I don't supposed having most of the earth's land covered by glaciers has anything to do with this lack of evidence.
Interestingly, cities are now being discovered -- now covered by the ocean -- which would have been on dry coastal land during the last ice age.I suspect -- without proof -- that some of the ancient civilizations that built elaborate temples equaling the size of the Egyptian pyramids, might have been the work of older civilizations forced to move inland as the coasts were flooded.