I really don’t like the term “Modern Liberalism”
In the 20th Century the term “Liberalism” was coopted and adopted by the Progressive Movement after the term “Progressive” became too closely associated with Socialism/Communism (rightly so) and was a net negative for those seeking power and policies under its banner.
Funny enough, given that “Liberalism” was completely trashed in the 1970s and 80s (culminating with Reagan’s use of it as an epithet) the Progressive Movement returned to using the term “Progressive.”
“Liberalism” (in the classic sense) is a perfectly good word that was completely corrupted to serve political ends.
Modern Liberalism dates from the 19th century and still exists outside the US.
What you Murricans have is Post-modern Liberalism