Which topic is often used as a theme for studying 20th-century world history?

Decolonisation and Nationalism

Explanation:

Decolonization and nationalism topic is often used as a theme for studying world history since World War I.  In the modern era after world war I many colonies gained their Independence. This happened because of revolutionary movements with a burning desire for self-rule.

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Explanation:

keeping a cash reserve because cash flow is the the movement of money through a company and if it just sits there, it wont the movement

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