Henry and Catherine- Conditional

What did Henry VII  do to unite England?                  
What did He (and Elizabeth) do to create a close relationship with Spain?

Conditional sentences and the Divine Right:

Arthur should have been king, not Henry . If Arthur had been
Arthur shouldn't have died   If Arthur hadn't
Catherine and Arthur should have had a son  If..
Catherine of Aragon shouldn't have married Henry If.
Henry had to ask permission to the Pope If Henry hadn't/ needn't 
Catherine and Henry shouldn't have had a daughter.  If..