I've always been curious if the internationalization of political discussion was behind the changing definitions of the word "liberal" in US politics.

In the 1990s, "liberal" was used as a synonym of "leftist"; a "liberal" politician would support expanding the welfare state, for example. My understanding is that the European definition of "liberal" is different, and implied a light touch in business affairs; the Economist is a "liberal" publication.

In 2019, this definition has spread to the United States as well; members of the Democratic Socialists of America don't identify as liberal. The European definition is only used in some circles: conservatives tend to stick to the old definition, and would describe somebody like Bernie Sanders as "liberal". I was always curious if this was because US political activists were talking to European ones on sites like Twitter, or Internet forums before it.