[gjulianm]

Not everyone, but a majority. Going to vote was strongly correlated with being for independence: it was clear the referendum wasn't legally binding and wasn't approved by the Spanish government. People who didn't want independence didn't even bother to vote in that.

And it's not an hypothesis: polls and parliament votes have shown for years that the support for independence (or for independentist parties) has been fairly stable at around 45-50%. Support for a referendum vote has been wider (up to 70-80% depending on the poll and how you count some party's positions) but similarly fairly stable over the years.

[rosndo]

Remember that in many places it was very difficult to vote due to violent interference by Guardia Civil.