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%
13%
0%
20%
15
flagSpain
60%
6%
6%
20%
30
flagthe United Arab Emirates
59%
18%
13%
9%
22
flagFrance
57%
10%
8%
20%
49
flagthe United States
56%
9%
8%
24%
472
flagItaly
56%
13%
16%
13%
30
flagUkraine
56%
6%
0%
37%
16
flagGermany
55%
16%
6%
21%
160
flagCanada
55%
13%
5%
26%
38
flagthe United Kingdom
52%
15%
13%
18%
351
flagPoland
50%
15%
11%
22%
9905
flagUnknown
50%
12%
12%
25%
48
flagNorway
50%
35%
5%
10%
20
flagDenmark
50%
15%
0%
35%
20
flagSweden
47%
9%
4%
38%
21
flagAustralia
44%
12%
4%
40%
25
flagthe Netherlands
43%
16%
12%
27%
48
flagRepublic of Ireland
40%
16%
3%
38%
55
flagIndia
35%
18%
19%
25%
97

Gender

men50%
women41%
in the oil industry
50%
41%
by selling supplies to the army
16%
17%
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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