Final answer:
The creation of Austria-Hungary resulted in increased military strength, ethnic and national tensions, and economic instability.
Step-by-step explanation:
The creation of Austria-Hungary brought about several difficulties, including increased military strength, ethnic and national tensions, and economic instability. As the Austrian Empire included people of different ethnicities, their nationalism emerged, leading to demonstrations and demands for self-governance. The Hungarian and Czech populations sought their own legislatures, and rebels in Prague, Vienna, and Hungary were crushed by the Austrian military. Additionally, the economic stability of the newly formed Austria-Hungary was compromised due to the different economic systems and disparities between the regions.