Spain's Catalonia is voting on independence on Sunday

Catalonia, a region in Spain, plans to vote on independence this Sunday in a referendum declared illegal by the Spanish government.
The Spanish government has recently cracked down on the referendum.
Even if the government manages to stop the vote, simmering tensions could pose a challenge for Spain going forward, analysts say.
Catalonia, a region in Spain that includes Barcelona, plans to vote on independence this Sunday in a referendum that has been declared illegal by Spanish autho