How did the lack of new conquests hurt the roman empire?

The lack of the new conquests hurt the Roman empire by "putting an end to a new source of wealth".

The lack of new conquest was one of the reasons for the decline of the Roman empire. Soldiers of the Roman army left their posts in lack of new conquests and hence, leaders of different empires or the tribes advanced their military, which resulted in the defeat of Rome.

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation:

hhebeueubevcje. he. me. e beben