The motivation was to stop political opponents. The attacks were based on where it was believed that insurgents and dissidents were and mass killings were conducted in order to remove political opponents and those who were part of the rebellion, or supported the rebellion. Omar Bashir was the leader of the group that committed it.
The Great Depression effects were not yet overturned when 10 years later the World War II was beginning in Europe. The people in the United States felt they needed a strong leadership. The concept of "Imperial Presidency" is therefore tied to F.D. Roosevelt, who created the New Deal Programs. The helpful programs originated a strong federal bureaucracy , with him on top.
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