What part of the Moon surface had been known to humanity before the first photos of the dark side were taken in 1959?

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Moon's libration changes the angle from which the Moon is seen, allowing about 59% of its surface to be seen from the Earth (but only half at any instant). Moon's libration is caused by the eccentricity of its orbit around Earth and by a slight inclination of its axis of rotation.
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Answers by country

52%
59%
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flagIraq
8%
91%
0%
0%
12
flagSouth Africa
26%
66%
0%
0%
15
flagFrance
26%
60%
4%
4%
23
flagSingapore
33%
58%
8%
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12
flagPoland
35%
52%
7%
3%
18326
flagthe United Kingdom
35%
50%
8%
5%
237
flagNew Zealand
34%
50%
3%
7%
26
flagthe United Arab Emirates
44%
48%
0%
8%
25
flagthe Philippines
36%
46%
10%
5%
79
flagRepublic of Ireland
37%
45%
16%
0%
24
flagIndia
40%
44%
9%
3%
696
flagGermany
45%
42%
7%
5%
40
flagthe Netherlands
58%
41%
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0%
17
flagIndonesia
16%
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16%
25%
12
flagthe United States
43%
38%
10%
5%
677
flagPakistan
50%
38%
7%
4%
42
flagAustralia
40%
37%
12%
6%
62
flagUnknown
38%
35%
17%
7%
39
flagGreece
58%
35%
5%
0%
17
flagCanada
50%
33%
10%
3%
57