claim: In the 11,400 years since the end of the last Ice Age, sea  level has risen at an average of 4 feet / century, though it is now rising  much more slowly because very nearly all of the land-based ice that is  at low enough latitudes and altitudes to melt has long since gone.
evidence: During the most recent North American glaciation, during the latter part of the Last Glacial Maximum ( 26,000 to 13,300 years ago ), ice sheets extended to about 45th parallel north.