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
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answers
flagFrance
10%
84%
0%
5%
19
flagBelarus
9%
78%
12%
0%
33
flagthe Netherlands
16%
76%
8%
0%
25
flagAustria
15%
76%
0%
7%
13
flagItaly
15%
75%
0%
10%
20
flagSpain
19%
74%
6%
0%
31
flagGermany
7%
69%
10%
13%
137
flagRepublic of Ireland
14%
63%
10%
10%
47
flagGreece
19%
61%
4%
14%
21
flagPoland
18%
56%
14%
8%
17094
flagAustralia
23%
53%
0%
23%
26
flagSweden
15%
53%
23%
7%
13
flagCzech Republic
16%
50%
16%
16%
12
flagLithuania
17%
47%
5%
29%
17
flagUnknown
42%
42%
14%
0%
14
flagthe United Kingdom
29%
41%
15%
12%
223
flagthe United States
33%
37%
13%
13%
158
flagCanada
22%
33%
8%
27%
36
flagIndia
35%
28%
17%
15%
39
flagUkraine
33%
27%
16%
22%
18