What effect did the union of Germany and Austria have on Europe?

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. 

where is the passage

i cant solve it without knowing the passage

the crusaders are identified in the painting;

c. by the red crosses on their backs

ththis should be under spanish