Which preposition to use with worsening

from Occurrences 1%

In spite of the economic consolidation at the beginning of the Later Han dynasty, and in spite of the more balanced trade, the political situation within China steadily worsened from A.D. 80 onwards.

of Occurrences 1%

So the balance-sheet of the peace, after three years from the armisticethat is, three years from the Warshows on the whole a worsening of the situation.

Which preposition to use with  worsening