What river forms a natural barrier between the United States and Mexico?

Read this passage from elie wiesel's 1999 speech "the perils ofindifference": the depressing tale of the st. louis is a case in point. sixtyyears ago, its human cargo - nearly 1,000 jews - wasturned back to nazi germany. and that happened after thekristallnacht, after the first state sponsored pogrom, withhundreds of jewish shops destroyed, synagogues burned,thousands of people put in concentration camps. and thatship, which was already in the shores of the united states,was sent back.what rhetorical strategy is wiesel using in the passage?

Ships can transit between the atlantic and pacific oceans using the canal.

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