Answer:
USA PATRIOT Act
Explanation:
Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism (USA PATRIOT) Act of 2001 mains at detecting and punishing the activities of terrorists in and around the United States. The act emphasizes exploring and detecting terrorist acts and scrutinizing them to put an end to such activities. The sources financing such acts are also detected and brought to an end under this act.
According to Alexander Chess and Stella Thomas, a child who expresses a low activity level, is somewhat negative, and is inflexible is a slow-to-warm-up child.
The term slow-to-warm-up children is used to denote children who are uneasy or cautious in new situations or with unfamiliar people and may have a difficult time with changes like a new child care provider, for example.
From what I can gather, the answer is either C. Many came to join family already in the United States, or D. Many were attracted by the opportunities to fight in the Civil War. (Sorry if it doesn't help).