Grassroots movement and bottom-up european integration

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Dear Communication (COMM),

Under the right of access to documents in the EU treaties, as developed in Regulation 1049/2001, I am requesting documents which contain the following information:

Many time we are hearing about the top-down Europeanization that was made by the European elites. But I am more interested in bottom-up approach, which grassroots movement or ideas contributed that EU as we know it today exist? Is there any good scientific approach to write about bottom-up movement?

Thank you for the answer!

Yours faithfully,

Tomaž Čebela