The website Our World in Data codes the Czech Republic as having been a "colony" up to and including 1992 at this chart:
When you click on the "Sources" tab, it is stated:
If a country was colonized in a given year is encoded as -20.
Is this labeling of the Czech Republic as a "colony" in 1945–92 correct?
This seems to me a little strange and a little like calling California a "colony" of the United States. Would it not be more correct to instead label the Czech Republic as a part of Czechoslovakia in those years?