Question

Francisco Franco’s ability to seize and maintain power rested mainly on his

Answer 1

ability to align himself with powerful groups

Step-by-step explanation:

WorldCitizen is correct. This is just the way the answer is worded on the (my) test.

Answer 2

I would say that the deciding factor was that he made the "right" alliances - for example he was on friendly terms with Nazi Germany, which saved Spain from being invaded by Nazi Germany and also within Spain, he made some associations with some groups that helped him maintain his power.