Final answer:
Trust spike explained by changes post-9/11 and social familiarity trust factors.
Explanation:
Increased trust during the "trust spike" period can be attributed to various factors such as changes in beliefs following the 9/11 terrorist attacks, leading to an increase in trust in government. Additionally, amid high social uncertainty, there were high levels of reported trust in family, kin, and friends, which could have influenced overall trust levels.
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