Hi, Thank you for your question and welcome. My name is ***** ***** I will assist you.
A cartoon is a drawing which is protected by copyright.
The length of copyright protection is the life of the author plus 70 years.
What you need to find out is a) if the author is still alive b) if not when he died and c) whether he has any surviving family,
If the copyright has expired then you should be free to use it.
What do you intend to use it for? What does the cartoon depict?