What is the meaning of the "mass division" in the following passage by Ali Smith?

"Meanwhile, you’ve got the mass division of 65 million people crossing the world from parts of it which are untenable, unliveable and in flames. And what’s left of the world deciding whether or not to open the gates or the walls or to build more gates or walls. "
Update: Which of the following the word "division" mean in this context?
1. the act of separating something into parts or groups, or the way that it is separated
2. a separate part of an army or large organization
Update 2: “The notion of a referendum is in any case a divisory line: you choose one side. Meanwhile, you’ve got the mass division of 65 million people crossing the world from parts of it which are untenable, unliveable and in flames. And what’s left of the world deciding whether or not to open the gates or the walls or to... show more “The notion of a referendum is in any case a divisory line: you choose one side. Meanwhile, you’ve got the mass division of 65 million people crossing the world from parts of it which are untenable, unliveable and in flames. And what’s left of the world deciding whether or not to open the gates or the walls or to build more gates or walls. How can we live in the world and not put our hand across a divide? How can we live with ourselves? It isn’t either/or. It’s and/and/and. That’s what life is.”
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