History of Space Exploration: Chapter 3, Exercise 3 — Possible Solution
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WHAT THE CHAPTER SAYS
Kennedy campaigned in 1960 on closing a "missile gap"; advisers are reported
to have overestimated Soviet rocket strength, despite U-2 intelligence.

WHAT A HISTORIAN WOULD NEED
The actual number of Soviet missiles at the time (not given in the chapter),
what US intelligence knew and when, and what advisers said. The chapter reports
one view from an article and does not settle it.