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
flagCroatia
65%
11%
3%
19%
26
flagSwitzerland
65%
15%
0%
20%
20
flagthe United Arab Emirates
64%
16%
12%
8%
25
flagItaly
63%
10%
10%
14%
47
flagFrance
62%
8%
7%
17%
56
flagSpain
58%
5%
5%
22%
36
flagGermany
56%
12%
6%
22%
231
flagthe United States
55%
9%
8%
25%
539
flagthe United Kingdom
55%
13%
12%
19%
459
flagCanada
55%
17%
4%
22%
45
flagDenmark
55%
14%
0%
29%
34
flagNorway
54%
29%
4%
12%
24
flagUkraine
52%
4%
4%
38%
21
flagPoland
51%
14%
10%
22%
14818
flagthe Netherlands
50%
18%
9%
22%
66
flagUnknown
47%
10%
11%
29%
722
flagAustralia
45%
12%
3%
38%
31
flagSweden
41%
12%
4%
37%
24
flagRepublic of Ireland
39%
13%
9%
36%
66
flagIndia
33%
20%
22%
22%
116

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%

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How did John Davidson Rockefeller get rich?
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