Final answer:
The most common bomb threat delivery methods are through phone calls, written messages, and now digital means. The Oklahoma City Bombing and Boston Marathon attack showcase terrorism's societal impact and the government's response with enhanced antiterrorism measures.
Step-by-step explanation:
The most common delivery of a bomb threat, historically, has been through communication channels like phone calls or written messages. However, with technical advancements, threats can now also be delivered digitally. Examining past events like the Oklahoma City Bombing and the Boston Marathon attack reveals a complex and troubling aspect of social studies: terrorism's impact on society. These attacks led to immediate and long-term societal and governmental responses, including increased funding for antiterrorism programs and improvements in security measures to prevent similar tragedies.