a bond between a vassal and its master to fight for land...
no?
Feudalism started in the 9th century, during the Medieval Era. It was very popular, but most nations now are not using a feudal system.
Sometimes it was called the Warring Kingdoms Period or the Waring States Period.
Trading increased because along the way they saw new things they liked also kings gained power as many soilders died in the crusades. Many jobs opened up because many people died and serfs wanted to be payed for what they did there for ending fuedilism in England.