'From the river to the sea' – a Palestinian historian explores the meaning and intent of scrutinized slogan

What does the call "From the river to the sea, Palestine will be free" mean to Palestinians who say it? And why do they keep using the slogan despite the controversy that surrounds its use?

https://theconversation.com/from-the-river-to-the-sea-a-palestinian-historian-explores-the-meaning-and-intent-of-scrutinized-slogan-217491