The keywords of phrase 5 are "America," "old," "ill," "strength," "delegate," "Constitutional Convention," "work," "humanitarian" and "scientific societies."
We can arrive at this answer because:
In sentence 5, we can state that the keywords are those that present Frakling's health status and the importance of his role in American politics.
More information about keywords on the link:
https://brainly.com/question/4949458