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
flagthe United Arab Emirates
62%
16%
12%
8%
24
flagSpain
61%
5%
5%
17%
34
flagCroatia
61%
14%
0%
23%
21
flagFrance
59%
9%
7%
19%
52
flagthe United States
57%
9%
8%
23%
498
flagItaly
56%
13%
13%
16%
37
flagCanada
55%
13%
5%
26%
38
flagthe United Kingdom
54%
13%
12%
18%
408
flagGermany
53%
15%
7%
22%
180
flagUkraine
52%
5%
5%
36%
19
flagPoland
50%
14%
11%
23%
12817
flagDenmark
50%
15%
0%
35%
20
flagNorway
50%
35%
5%
10%
20
flagUnknown
48%
10%
11%
29%
620
flagSweden
47%
9%
4%
38%
21
flagAustralia
46%
10%
3%
39%
28
flagthe Netherlands
45%
18%
11%
24%
53
flagRepublic of Ireland
41%
15%
5%
36%
60
flagIndia
34%
18%
20%
26%
99

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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