Answer:
The answer is slavery, and to perseve the union however, slavery is the main reason.
The effects of Zhou metal workers mastering iron were…
Option A: during the Zhou dynasty, China was characterized by warfare, political and military reforms, but it was first unified during the Qin dynasty.
Option B: it is true that with the introduction of iron, China acquired stronger and more effective farm tools as well as increasing crop yield.
Option C: during the Zhou dynasty China not only developed iron technology but also improved technology of war making better weapons by means of smelted iron. As a result, iron weapons spread to the masses, contributing to the Warring States period.
Option D: it is also true that the Zhou jealously guarded the secret of smelting the iron and created a trading empire. The iron production encouraged trade and improved the empire economy.
Option E: Zhou craftsman are known for their iron art and it is still sold today. During the Zhou period, the craftsmanship had great importance for his skills for producing sophisticated iron weaponry.
Option F: Iron helped the Zhou rulers so much that they reserved the Mandate of Heaven for themselves alone. It was a period of cultural and intellectual expansion during Zhou era and the iron helped rulers keep the control of the land
.
Under the feudal system the land was usually officially owned by the King of an area, however, it was given to nobles or in this case knights in exchange for money and loyalty. These nobles had to pledge their support for the King and their willingness to fight if there was ever a conflict that necessitated their support.
The item in the list which was <u>NOT</u> a justification for increased US involvement in Vietnam:
<h2>To keep North Vietnam aligned with the United States.</h2>
Explanation:
North Vietnam never was aligned with the United States. The US was aligned with and fought on behalf of South Vietnam. North Vietnam was controlled by a communist government and was seeking to unify Vietnam under communist control.
US foreign policy in those years was one focused on fighting communism. Domino theory was a major idea in US thinking at the time. Domino theory proposed that the spread of communism in Vietnam would result in other countries in the region falling like dominoes to the influence of communism.
The event that sparked a major increase of US involvement in Vietnam was the allegation of attacks on US naval ships in neutral waters in the Gulf of Tonkin. The Gulf of Tonkin Resolution was a measure passed by US Congress that allowed the US President to make military actions, like increase troops, without formal declaration of war. The resolution was passed by Congress in August, 1964, after alleged attacks on two US naval ships in the Gulf of Tonkin. The key wording in the resolution said:
- <em>Resolved by the Senate and House of Representatives of the United States of America in Congress assembled, that the Congress approves and supports the determination of the President, as Commander in Chief, to take all necessary measures to repel any armed attack against the forces of the United States and to prevent further aggression.</em>
That resolution served as a blank check for President Lyndon Johnson to send troops to whatever extent he deemed necessary in pursuance of the war. Between 1964 and the end of Johnson's presidency in 1969, US troop levels in Vietnam increased from around 20,000 to over 500,000.
