American religion
Trollope is no fan of American evangelicalism. She notices that evangelicalism seems to have abandoned Christian tradition. She sees American religion as detached from its values, and she suspects that the whole idea of a Christian revival seems to be motivated by business enterprise. In other words, she feels the American church looks a little too much like American business.
American fashions
Trollope notices that American sensibilities are not even remotely European anymore. She feels they have devolved and degenerated. She doesn't appreciate how casually and universally people accept slavery in the American south, and she doesn't like people's lack of manners in America. She tells a story about a person spitting tobacco onto their own carpet in their own home; she finds this behavior to be not exactly lady-like.
American government
Even as early as the 1830's, Trollope's can easily spot various aspects of American politics that seem troubled. Firstly, she notices that the politicians seem to be interested in their career more than their constituency, and also, she notices that the whole process of American politics seems to be about popularity and who people "like" rather than who will actually represent their interests.