Human sacrifice and expansion was the answer because the Aztecs were a feared tribe and conquered many people. They had always practiced human sacrifice and that was one of the reasons that Hernan Cortes had been horrified about. It couldn't have been anything about conquering Mayans because their civilization had died out for some strange reason.
If people have more dogs that require grooming, then more grooming services will be needed. This means that either the groomers will have to work more (unlikely) or new jobs in pet grooming will be created!
Containment, Containment was a foreign policy of the United States of America, introduced at the start of the Cold War, aimed at stopping the spread of Communism and keeping it "contained" and isolated within its current borders of the Union of Soviet Socialist Republics (USSR or the Soviet Union) instead of spreading to a war