Countdown by Deborah Wiles

From the Publisher: "It's 1962, and it seems everyone is living in fear. Twelve-year-old Franny Chapman lives with her family in Washington, DC, during the days surrounding the Cuban Missile Crisis. Amidst the pervasive threat of nuclear war, Franny must face the tension between herself and her younger brother, figure out where she fits in with her family, and look beyond outward appearances. For Franny, as for all Americans, it's going to be a formative year."

Publisher: Scholastic, 2010, 400 pp.

This Means War by Ellen Wittlinger

Juliet's longtime best  friend, Lowell has suddenly decided it is uncool to be friends with a girl.  Friendless, Juliet meets Patsy who suggests a series of tests to prove girls are far superior to boys.  Set in 1962 during the thirteen days of the Cuban Missile Crisis. 
Publisher, Simon and Schuster, 2010, 211 pp.