The correct answer to this open question is the following.
Although you forgot to include the introduction, and the authors' names, doing some research we can comment on the following.
The big changes in the nation's political life between 1824-1840 were that in the presidential elections of 1824 the elections lacked proper organization and infrastructure. Relatively few people participated in the election. On the other hand, in the 1840 presidential elections, US politics changed and the development of campaigns and candidates increase to have better elections in that year and more citizen's participation. The way political campaigns were organized and launched produced more interest in the American people and they started to involve more in the process and the candidates.
