Looking For A Simple Country/territory Dataset With Population And Area

Hi all, subject says it all. I was using the countryinfo package in Python but it is incomplete and outdated, I think. Any format would be fine, REST API form of some kind would be the very best though. Thank you in advance. I apologize if this is common knowledge or asked frequently.

edit: when I say territory, I mean that distinct/separate areas should be separate in the dataset, for instance Puerto Rico should be separate from the 50 states; British territories in the Caribbean should be separate, etc