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
flagthe United Arab Emirates
64%
16%
12%
8%
25
flagItaly
63%
10%
10%
15%
46
flagSwitzerland
63%
15%
0%
21%
19
flagSpain
60%
5%
5%
20%
35
flagCroatia
60%
13%
4%
21%
23
flagFrance
59%
9%
7%
19%
52
flagGermany
57%
13%
7%
21%
212
flagDenmark
57%
15%
0%
26%
26
flagthe United States
56%
9%
8%
23%
516
flagthe United Kingdom
55%
13%
11%
18%
448
flagCanada
54%
16%
4%
23%
42
flagNorway
54%
29%
4%
12%
24
flagUkraine
52%
5%
5%
36%
19
flagPoland
51%
14%
10%
22%
14175
flagthe Netherlands
50%
18%
9%
22%
66
flagUnknown
47%
10%
11%
29%
696
flagAustralia
44%
13%
3%
37%
29
flagSweden
41%
12%
4%
37%
24
flagRepublic of Ireland
40%
13%
9%
35%
65
flagIndia
33%
20%
20%
24%
105

Gender

men49%
women41%
in the oil industry
49%
41%
by selling supplies to the army
13%
16%
by mining diamonds and gold
9%
15%
by building railroads
27%
26%

Language versions

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answers
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How did John Davidson Rockefeller get rich?
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