There are places on the planet (areas that were originally covered by continental glaciers) where the land masses are still rising due to isostatic rebound. Places like Canada and our own New England are areas where formations, (once under sea level even when the glaciers accounted for sea level decline), are actually still rising out of the sea . Places along the Maine coast show such rebound as well as along the coasts of Labrador etc.
However, when we get to the areas well south of Pleistocene glaciation moraines and G/F deposits, we see the islands and shorelines being slowly inundated. Heres a measure of bouy 193797 (a key sea level marker for shoreline development in the Delaware/Chesapeake systems