Answer:
The Battle of Saratoga
which caused The French to Join
and
The Battle of Yorktown which forced Britain to surrender
The objective of the Congress was to provide a long-term peace plan for Europe by settling critical issues arising from the French Revolutionary Wars and the Napoleonic Wars.
The goal was not simply to restore old boundaries but to resize the
main powers so they could balance each other and remain at peace.
A serf is an agricultural laborer bound to the land of the nobility they work for (part of feudalism). It has been used throughout many civilizations up until about the 20th century.
Islam spread through military conquest, trade, pilgrimage, and missionaries. Arab Muslim forces conquered vast territories and built imperial structures over time.
Feudalism was an oppressive government system; once you were born into a class, you stayed there. There was very little social mobility, so it’s quite apparent to see why only the royals and nobles would benefit from such.