What was the "missile gap" and why do you think that it was a concern of President Eisenhower?

The missile gap

Explanation:

The Missile Gap was a term used during the Cold War to indicate the superiority of the number and power of the Soviet missiles in comparison with the U.S. It was a concern for President Eisenhower as it was the issue related to the national defence. Intelligence reports showed the Soviet missile-building capabilities which 500 to 1,000 ballistic missiles. Where, American missile production, had a small number compared with the Russians.

where is the diagram

a.

congress passed laws allowing for free passage between states.