Raven has Sloth returned to work; telling him Pride will be angry. Sloth knows better than to go against Pride, and Father by extension
The Crests of Blood have been carved decades apart to avoid suspicion. The forceful expansion of Amestris was to accommodate the creation of the transmutation circle's points.
Whenever a Crest of Blood was halted, Father had Wrath wend Central troops to massacre more people.