Although Poland possessed the vast Eastern European plains, abundant mineral resources, and convenient inland river transportation, it was in a state of decline due to an utterly foolish political system.
At present, Poland had almost no decent industrial base; its financial backbone was grain exports. However, agricultural output was limited by serfdom, and grain production wasn't particularly impressive either.
Thus, Poland was exceedingly poor, with military funding especially stretched thin.
During the earlier wave of nationalist fervor, a significant number of Poles were willing to join the military, but the country couldn't afford to sustain them.
France's finances were also tight, so it naturally wouldn't simply "throw money" into aid like England did.
Joseph's solution for Poland was to fully mine the Tarnovsk Mountain Silver Mine.
In his memory, this silver mine was the world's largest producer in the 21st century, with an annual output exceeding a thousand tons.