Why are the European revolutions of 1848-1849 called incomplete?

The revolutions of 1848-1849, known in some countries as the Spring of the Nations, the Spring of the Nations, the Spring of the Nations, or the Year of the Revolution, were a series of political upheavals across Europe in 1848. It remains the most pervasive revolutionary wave in European history.
The revolutions were essentially democratic and liberal, with the aim of eliminating old monarchical structures and creating independent nation states.
The uprisings were spearheaded by coalitions of reformers, middle class and workers who were unable to act together for long. Tens of thousands of people were killed, and many of them were forced to leave their countries and the revolutions did not lead to the expected result, which is why they were called “incomplete”.