'No borders' isn’t a brand-new idea, it's actually borders themselves that are a relatively new concept. Even in the late 19th century, most of the world’s borders could be freely crossed without a passport. To be specific: Britain’s immigration laws which provide the blueprints for the enforcement of borders on British soil could be said to originate with the 1905 Aliens Act. As Nadine El-Enany explains in Bordering Britain, the Aliens Act "primarily targeted poor Jewish people, categorised as ‘aliens’, who were seeking protection from persecution". Before this, laws had been passed in countries colonised by Britain to stop people travelling from the colonies to the central hub of the empire. What this tells us is that Britain’s borders are a fiction, ostensibly created to shut out racialised people from the UK, in order to protect the interests and capital of the rich and powerful.
'No borders' politics or working towards border abolition encourages us to think a bit more deeply about inequality.
A world without borders is about a world rooted in fairness and social justice rather than structural inequality, which is how the world is currently organised.