The last time I looked at this USGS page, they made it clear that before the Little Ice Age, glaciers in Glacier National Park were very small or non-existent, and that they may not have survived the Holocene maximum either.
2020 version.
History of Glaciers in Glacier National Park
But the Medieval Warm Period and Holocene Maximum have since been erased by climate fraudsters, and the text has been changed to match.
2021 version.
