Final answer:
The efforts of liberal German leaders in 1848-1849 to unify the German states into one nation were unsuccessful.
Step-by-step explanation:
A significant result of the efforts of liberal German leaders in 1848-1849 was the failed attempt to unify the German states into one nation.
The all-German parliament, known as the Frankfurt Assembly, met to write a constitution for this unified Germany. However, the resulting constitution was not accepted by many German leaders, and the movement toward unification was unsuccessful.
This failure was due to several factors, including the difficulty of deciding whether to include the German-speaking areas of Austria and Prussia in the united Germany. The creation of a large, unified nation in central Europe would have posed a threat to other European nations in the event of war.
Overall, the efforts of liberal German leaders in 1848-1849 resulted in an unsuccessful attempt at unifying the German states into a single nation.