the native community are loosing their ancestral lands
If something seems temporary, use estar, if it is more permanent quality, use ser. When you are thinking about whether to use ser or estar, consider which question the verb “to be” is answering. If you want to talk about ‘where’ something is, use estar.
Ante ayer mis primos prefirieron ir a la playa y no a la piscina.
B.Leer
I’m pretty sure that’s the right answer