The literary device that Gordimer employs in the excerpt is Imagery.
Imagery is a literary device used to represent objects, actions, and ideas in such a way that it appeals to our physical senses. Usually it is thought that imagery makes use of particular words that create visual representation of ideas in our minds.
When Congress sent President Jackson the bill, he vetoed it. To him, the bank was a private institution that benefited only a few people. He was concerned that the government did not have enough control of the bank. He also thought it took away rights from state banks.