In XX century Poland declared war only once. On which country?

Germany
Japan
Ukraine
USSR
Poland declared war on Japan on 20th December 194 as most of WW2 allies. Though Empire of Japan refused to accept a state of war due to friendly relations between the two countries. Despite that legally the state of war lasted until 8th February 1957. It might be the longest war without any clash.
smyru
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Very interesting!
reach: rather country specific20th centuryhistory of PolandPolandwars

Answers by country

Germany
Japan
Ukraine
USSR
answers
flagFrance
0%
91%
0%
8%
12
flagSpain
13%
82%
4%
0%
23
flagBelarus
14%
76%
9%
0%
21
flagAustria
20%
70%
0%
10%
10
flagRepublic of Ireland
9%
68%
13%
9%
22
flagGreece
12%
68%
6%
12%
16
flagGermany
10%
62%
10%
16%
59
flagthe Netherlands
33%
58%
8%
0%
12
flagSweden
18%
54%
27%
0%
11
flagPoland
20%
53%
16%
9%
14665
flagAustralia
26%
47%
0%
26%
19
flagLithuania
17%
47%
5%
29%
17
flagthe United Kingdom
28%
45%
14%
11%
119
flagIndia
26%
42%
10%
15%
19
flagUnknown
42%
42%
14%
0%
14
flagthe United States
34%
36%
17%
11%
97
flagCanada
12%
31%
12%
37%
16
flagUkraine
35%
28%
21%
14%
14