Most South American countries gained independence between 1810 and 1830.
The inert properties of nitrogen make it a good blanketing gas for dangerous solids and liquids. So nitrogens inert properties are used to stop contact of steel and air.
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The United States ignored the idea of the Spheres of Influence and instead created a policy to help protect America's trade relations with China. ... It was a cornerstone in American Foreign Policy in East Asia for 40 years (The Editors of Encyclopaedia).
Explanation:
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