Answer:
They began to centralize power.
Explanation:
For example, in medieval times, at the height of feudalism, kings did not have standing armies at their disposal, and had to tour the land, looking for military support from the nobles (feudal lords), whose armies were more loyal to them than to the monarch.
This changed as Europe entered the modern age. Kings began to rely on mercenaries and small professional armies, effectively reducing their dependency on military help from the feudal lords.
The same applies for taxation. Monarchs began to develop more efficient methods of tax collection that applied for the whole territory. In the modern era, the absolute kings of France like Louis XIV did not have to rely on the help of the nobles to collect taxes, they could collect all the taxes they needed on their own.
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What changes igneous or sedimentary rocks into metamorphic rock?
This process happens when magma goes into the cooling stage and creates crystals. Magma is made of hot materials.
Congress had to approve of military appointments.
The War Powers Resolution was made so that the President of the United States could not commit to an armed conflict without the consent of the Congress.