Which of the following statements is incorrect?

a- The disintegration of the USSR led to the creation of a multipolar world.
b- The disintegration of the USSR led to the emergence of the USA as the sole superpower.

Only statement a is incorrect.

Second, power relations in world politics changed and, therefore, the relative influence of ideas and institutions also changed. The end of the Cold War left open only two possibilities: either the remaining superpower would dominate and create a unipolar system, or different countries or groups of countries could become important players in the international system, thereby bringing in a multipolar system where no one power could dominate. As it turned out, the US became the sole superpower. Backed by the power and prestige of the US, the capitalist economy was now the dominant economic system internationally.