There are many examples of political treatises in a literary form from history. Mary Wollstonecraft's 'A Vindication of the Rights of Woman' of 1792 is just one example of literature which has led to social change. However, artful literary works also play their part in aspects of societal reformation, too. In the nineteenth century, many of Charles Dickens' works, for example, focussed on social issues which led to changes in the politics of the day. Later literary works by writers such as Maya Angelou have also helped to change society, too. Much of her work centred on attitudes toward race in the United States. Literature makes a contribution to reforming society but cannot do it without a broader context of change.