ELI5: Explain Like I'm 5

Proletarian internationalism

Proletarian internationalism is a way of thinking that all workers, all around the world, should support and work together to make their lives better. Proletarian internationalism means that workers in different countries can look past their differences in language, culture, and nationality and join together against those who are trying to keep them down. It's like people who don't know each other, but are all wearing the same t-shirt. They may not know each other, but they're all going to the same place. Proletarian internationalism is a way of saying, "we're all workers together, no matter where we're from, let's work together to make our lives better".