Final answer:
The failure of the Frankfurt Parliament can be attributed to the lack of meaningful links with the majority of the German population, the involvement of monarchs and their officials, and the controversy surrounding the inclusion of German-speaking areas of Austria and Prussia in the united Germany.
Step-by-step explanation:
The factors that led to the failure of the Frankfurt Parliament include:
- The lack of meaningful links with the majority of the German population, who did not live in or near capital cities.
- The involvement of monarchs and their officials working behind the scenes to re-establish control of their armies and support.
- The difficulty in deciding whether to include the German-speaking areas of Austria and Prussia in the united Germany, which caused controversy among the German leaders.