Why did European countries allow Adolf Hitler and Germany to violate the
terms and conditions of the Treaty of Versailles?

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful. 

a. by accepting the election of president abraham lincoln in 1860 and convincing other southern states to do the same