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%
92%
0%
7%
13
flagSpain
13%
82%
4%
0%
23
flagBelarus
14%
76%
9%
0%
21
flagthe Netherlands
23%
70%
5%
0%
17
flagAustria
20%
70%
0%
10%
10
flagRepublic of Ireland
8%
68%
12%
12%
25
flagGreece
12%
68%
6%
12%
16
flagGermany
9%
61%
11%
17%
63
flagSweden
18%
54%
27%
0%
11
flagPoland
20%
53%
16%
9%
14887
flagLithuania
17%
47%
5%
29%
17
flagthe United Kingdom
28%
45%
14%
11%
128
flagAustralia
28%
42%
0%
28%
21
flagUnknown
42%
42%
14%
0%
14
flagIndia
27%
40%
9%
18%
22
flagCanada
11%
35%
11%
35%
17
flagthe United States
33%
34%
17%
12%
103
flagUkraine
33%
26%
20%
20%
15