Answer:A vassal is a person regarded as having a mutual obligation to a lord.
Explanation:a lord is also someone who rules a land
The most likely answer why Western Europe became so successful in global politics was B - the chinese policy of isolation in my opinion.
China was a very advanced country which was at the same time extremely powerful and vast, putting it mildly. However, their choice of being an isolationist country made room for the smaller European countries to be at the center stage of world politics.
The Greeks discovered that diseases occur naturally. They discovered that you became sick because your body was reacting to the disease. The Greeks believed that if you stayed clean and washed your hands you could prevent diseases. The Greeks built temples for their gods, like The Parthenon. They built beautiful coloms to hold their building up. The Greeks greatest contribution is their way of government. Their Democracy.
