Within these last 19 months at least 45 satellites have circled the earth. some 40 of them were "made in the united states of america" and they were far more sophisticated and supplied far more knowledge to the people of the world than those of the soviet union. what rhetorical strategy is kennedy most clearly using in the excerpt?

Logos.

Explanation:

Logos or "an appeal to logic" is a mode of communication used by the speakers in their speech in order to persuade their audience. In this mode of persuasion, the speaker makes appeal based on logic, statistics, and facts.

In his speech, "We choose to go to the Moon", John F. Kennedy, is keeping statistics before his audience. His speech was focused to persuade his audience to participate in the project of launching a satellite and landing a man on the Moon.

He is showing how the United States is making progress by showing the statistics.  

So, the rhetorical strategy used is Logos.