Final answer:
Shaheen refers to Timothy McVeigh to exemplify the impact of domestic terrorism in the U.S. and to explain the motivations behind the Oklahoma City bombing, which prompted a unified national response and increased antiterrorism efforts.
Step-by-step explanation:
Shaheen brings up the example of Oklahoma City bomber Timothy McVeigh to illustrate the devastating impact of domestic terrorism in the United States and its underlying motivations. McVeigh was a former U.S. Army soldier who became disillusioned with the government and believed the Branch Davidians were victims of government terrorism. His attack on the Alfred P. Murrah Federal Building on April 19, 1995, led to a significant loss of life and highlighted political divisions within the nation. The aftermath saw a unifying response from Americans, increased bipartisan support for antiterrorism measures, and a reminder of commonality despite political differences.