Final answer:
Elizabeth Cady Stanton used rhetorical devices to make The Declaration of Sentiments more persuasive, employing parallelism and repetition.
Step-by-step explanation:
The technique that Elizabeth Cady Stanton used to make The Declaration of Sentiments more persuasive was rhetorical devices.
She employed various rhetorical strategies such as parallelism and repetition to emphasize her points and make them more memorable.
For example, in the Declaration, Stanton used the phrase 'We hold these truths to be self-evident: that all men and women are created equal,' which is a parallel structure that echoes the language of the Declaration of Independence.