Which best describes discretionary spending

Discretionary spending is a "Form of government spending that is authorized under special circumstances."

Discretionary spending is implemented through an appropriations bill, which is legislation passed to grant federal funds to specific federal government departments, agencies, and programs. Cases in which appropriations bill are enacted to allow discretionary spending is to fund the military during a war or grant foreign aid.

it affected it because the kingdoms (with trade) slowly got richer and richer.