If I understood your question correctly, then the answer is "it depends". Sometimes, individuals have a large impact on starting a war (think World War I where one individual caused the war to start), other times groups of people have also important roles in starting a war (think World War II).
After the death of Marcus Aurelius, the Roman empire slowly started to decline. Potential new emperors began to focus on pleasing the rich Patricians at the expense of the poor plebeians . The resulting decadence was just one reason for the fall of the empire.
(It needs to be pointed out that as the question seems incomplete and lacks more context, the answer might not meet the its standards).
Explanation:
Article 1=
Legislative branch
Structure: Senate and House Of Representatives
Job: Makes laws
Article 2=
Executive branch
Structure: President and Vice president
Job: Carries out and enforced laws
Article 3=
Judicial branch
Structure: One Supreme court and lower courts
Job: Interprets laws
The first step in developing a HACCP plan is to conduct a hazard analysis. :)