Context: The division between the two is often not clear and is often politicized in disagreements within a government over a treaty, since a non-self-executing treaty cannot be acted on without the proper change in domestic law. If a treaty requires implementing legislation, a state may be in default of its obligations by the failure of its legislature to pass the necessary domestic laws.

Question: What type of treaty cannot be acted on without the proper change in domestic law?
Answer: a non-self-executing treaty

Question: A state party may be in default of its obligations under a non-self-executing treaty if its legislature fails to do what?
Answer: pass the necessary domestic laws

Question: What institution of a party to a treaty must act to fulfill the party's obligations under a non-self-executing treaty?
Answer: its legislature

Question: The often unclear division between a self-executing treaty and a non-self-executing treaty can lead to a treaty being what if disagreements exist within a party?
Answer: politicized

Question: A treaty may be politicized due to disagreements within a party because the division between a self-executing treaty and a non-self-executing treaty can often be described as what?
Answer: not clear