A scattering and confusion of tongues helped retard corrupt technological advancement for one maybe. What if humans had access to nuclear weaponry by the 1940s even after a human scattering and confusion of tongues?
Dinosaurs have roamed earth since the flood and I've referred to little to no preflood art depicting one maybe, but who said there is no antediluvian archaeological evidence? The great pyramid is a preflood structure maybe. There might be numbers in here I don't stand by, but...
Herodotus, visiting in the fifth century BC, reported that inscriptions of strange characters were to be found on the pyramid's casing stones.
In AD 1179 the Arab historian Abd el Latif recorded that these inscriptions were so numerous that they could have filled "more than ten thousand written pages."
William of Baldensal, a European visitor of the early fourteenth century, tells how the stones were covered with strange symbols arranged in careful rows.
Sadly, in 1356, following an earthquake that leveled Cairo, the Arabs robbed the pyramid of its beautiful casing of stones to rebuild mosques and fortresses in the city. As the stones were cut into smaller pieces and reshaped, all traces of the ancient inscriptions were removed from them. A great library of ageless wisdom was forever lost.
Still further evidence that the dynastic Egyptians did not construct the Great Pyramid may be found in sediments surrounding the base of the monument, in legends regarding watermarks on the stones halfway up its sides, and in salt incrustations found within. Silt sediments rising to fourteen feet around the base of the pyramid contain many seashells and fossils that have been radiocarbon-dated to be nearly twelve thousand years old.
These sediments could have been deposited in such great quantities only by major sea flooding, an event the dynastic Egyptians could never have recorded because they were not living in the area until eight thousand years after the flood. This evidence alone suggests that the three main Giza pyramids are at least twelve thousand years old.
In support of this ancient flood scenario, mysterious legends and records tell of watermarks that were clearly visible on the limestone casing stones of the Great Pyramid before those stones were removed by the Arabs. These watermarks were halfway up the sides of the pyramid, or about 400 feet above the present level of the Nile River.
Further, when the Great Pyramid was first opened, incrustations of salt an inch thick were found inside. While much of this salt is known to be natural exudation from the stones of the pyramid, chemical analysis has shown that some of the salt has a mineral content consistent with salt from the sea. These salt incrustations, found at a height corresponding to the water level marks left on the exterior, are further evidence that at some time in the distant past the pyramid was submerged halfway up its height.
Note: Maybe at least font size is messed up there and I'm misquoting there for all I know. You might want to check this out... http://s8int.com/page13.html