Answer:
Federation: a group of states with a central government but independence in internal affairs.
Union: the action or fact of joining or being joined, especially in a political context.
Explanation:
1. B, the smaller twin is released!
2. A, feeling pain with the war
3. C, Christmas Celebration
4. A, transmitting a memory
5. B, having 3 children instead of 2
6. A, difficulty sleeping through the night
7. B, from reading books
8. B, sledding down a hill
Read this book earlier in the year! Hope I helped