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
64%
14%
0%
21%
14
flagSpain
62%
6%
6%
17%
29
flagFrance
59%
4%
9%
22%
44
flagthe United Arab Emirates
57%
19%
14%
9%
21
flagUkraine
56%
6%
0%
37%
16
flagthe United States
55%
9%
8%
24%
456
flagGermany
55%
16%
6%
20%
158
flagCanada
55%
8%
5%
29%
34
flagItaly
53%
14%
17%
14%
28
flagUnknown
52%
13%
16%
16%
36
flagthe United Kingdom
51%
15%
13%
19%
335
flagDenmark
50%
15%
0%
35%
20
flagSweden
50%
10%
5%
35%
20
flagPoland
49%
15%
11%
22%
9625
flagNorway
47%
36%
5%
10%
19
flagAustralia
44%
12%
4%
40%
25
flagthe Netherlands
42%
17%
12%
27%
47
flagRepublic of Ireland
37%
17%
3%
39%
51
flagIndia
35%
18%
19%
25%
97

Gender

men49%
women41%
in the oil industry
49%
41%
by selling supplies to the army
16%
16%
by mining diamonds and gold
8%
15%
by building railroads
24%
26%

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How did John Davidson Rockefeller get rich?
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