 Relativistic quantum field theory (see entry on  quantum field theory)  predicts an abundance of correlations between observables that are localized in spacelike separated (hence causally independent) spacetime regions. This is a consequence of prevalence of entanglement and of violation of Bell’s inequality in quantum field theory, which is even more striking than violation of Bell’s inequality by standard, non-relativistic quantum mechanics (Summers 1997; Clifton &amp; Halvorson 2001; Halvorson &amp; Clifton 2000; entry on  Bell’s theorem).  If relativistic quantum field theory is causally closed in the sense of providing common causes of these correlations, then this theory is confirming evidence for the truth of the Common Cause Principle.