This is the 10397th most frequent Turkish word.
birliğine
"Birliğine" means "to/into the union" or "to/into the unity."
In this sentence, 'birliğine' is used as a possessive form referring to the economic union to which the issue belongs.
Bu mesele, ekonomi birliğine ait sorunlardan biridir.
This issue is one of the problems belonging to the economic union.
Here, 'birliğine' indicates the organization receiving the donation, emphasizing ownership or association.
Öğrenciler yardım birliğine bağış yapmaya karar verdiler.
The students decided to donate to the aid association.
In this context, 'birliğine' refers to the environmental union being supported by the institutions, showing the entities involved in the action.