How did John Davidson Rockefeller get rich?

in the oil industry
by selling supplies to the army
by mining diamonds and gold
by building railroads
John Davison Rock­e­feller was the founder of the Standard Oil Company, which dom­i­nat­ed the oil industry in the U.S. As kerosene and gasoline grew in im­por­tance, Rock­e­feller's wealth soared, and he became the world's richest man and first American worth more than a billion dollars.

Answers distribution

in the oil industry
by selling supplies to the army
by mining diamonds and gold
by building railroads
answers
flagBelgium
68%
12%
6%
12%
16
flagCzech Republic
66%
16%
0%
16%
12
flagSpain
64%
7%
7%
14%
28
flagUU
58%
25%
8%
8%
12
flagLithuania
58%
8%
8%
16%
12
flagthe United States
55%
8%
8%
25%
436
flagItaly
55%
14%
14%
14%
27
flagCanada
53%
10%
7%
28%
28
flagGermany
52%
18%
6%
22%
136
flagDenmark
52%
17%
0%
29%
17
flagFrance
51%
5%
11%
25%
35
flagNorway
50%
33%
5%
11%
18
flagSweden
50%
11%
5%
33%
18
flagthe United Arab Emirates
50%
25%
12%
12%
16
flagPoland
48%
15%
11%
23%
8800
flagthe United Kingdom
48%
15%
14%
20%
292
flagAustralia
45%
12%
4%
37%
24
flagthe Netherlands
42%
19%
11%
26%
42
flagRepublic of Ireland
39%
17%
4%
36%
46
flagIndia
34%
18%
20%
25%
95

Gender

men49%
women40%
in the oil industry
49%
40%
by selling supplies to the army
16%
17%
by mining diamonds and gold
8%
15%
by building railroads
24%
26%

Language versions

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How did John Davidson Rockefeller get rich?
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