13. Use graph colouring to determine
the maximum number of colours
that can be used to colour
this map.
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Step-by-step explanation:
It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors. Over the next several years, consumer spending and investment dropped, causing steep declines in industrial output and employment as failing companies laid off workers.
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Great Depression: Black
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