Give reason why mumbai was called the prime city

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Mumbai is called the commercial capital of India, because Mumbai houses important financial institutions such as the Reserve Bank of India, the Bombay Stock Exchange, and the corporate headquarters of many Indian companies. ... The entire economy of India depends upon the status of stocks at the stock exchanges.

Explanation:

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the and revolutionary crimes act of 1919 , popularly known as the rowlatt act or black act, was a legislative act passed by the imperial legislative council in on 10 march 1919, indefinitely extending the emergency measures of preventive indefinite detention, incarceration without trial and judicial review enacted in the defence of india act 1915 during the first world war. it was enacted in light of a perceived threat from revolutionary nationalists to organisations of re-engaging in similar conspiracies as during the war the government felt the lapse of the dira regulations would enable

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