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
flagFrance
59%
4%
9%
22%
44
flagthe United States
55%
8%
8%
25%
446
flagGermany
55%
16%
6%
21%
157
flagUnknown
54%
20%
12%
12%
24
flagItaly
53%
14%
17%
14%
28
flagSweden
52%
10%
5%
31%
19
flagDenmark
52%
15%
0%
31%
19
flagthe United Arab Emirates
52%
23%
11%
11%
17
flagCanada
51%
9%
6%
32%
31
flagthe United Kingdom
50%
15%
13%
19%
322
flagNorway
50%
33%
5%
11%
18
flagUkraine
50%
8%
0%
41%
12
flagPoland
49%
15%
11%
23%
9281
flagAustralia
44%
12%
4%
40%
25
flagthe Netherlands
43%
17%
13%
26%
46
flagRepublic of Ireland
39%
18%
4%
35%
48
flagIndia
34%
18%
19%
26%
96

Gender

men49%
women41%
in the oil industry
49%
41%
by selling supplies to the army
16%
17%
by mining diamonds and gold
8%
15%
by building railroads
25%
26%

Language versions

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How did John Davidson Rockefeller get rich?
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