Discuss the primary causes of the English (or British) Civil Wars

Discuss the primary causes of the English (or British) Civil Wars (sometimes referred to as the War of the Three Kingdoms).  Draw from David Smith (History of the Modern British Isles); Jerome Friedman (The Battle of the Frogs). Be sure to refer to and/or quote as needed from these sources by author, title, and page number.  

Which of the causes seem most persuasive?  In your assessment, are there any particular causes without which war likely would not have broken out?  Using the sources above, support your argument. 

To what degree were any of the causes a product(s) of three, rather than one, kingdom? 

Did any of the causes originate, to some degree, in the sixteenth century?

What role did print or the press play?