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
flagSpain
4%
90%
4%
0%
21
flagBelarus
21%
78%
0%
0%
14
flagGreece
13%
73%
6%
6%
15
flagthe Netherlands
30%
70%
0%
0%
10
flagGermany
4%
65%
11%
18%
43
flagRepublic of Ireland
11%
58%
17%
11%
17
flagIndia
13%
53%
13%
13%
15
flagPoland
21%
52%
16%
8%
13827
flagAustralia
35%
50%
0%
14%
14
flagthe United Kingdom
30%
46%
13%
9%
97
flagLithuania
13%
46%
6%
33%
15
flagUnknown
42%
42%
14%
0%
14
flagthe United States
35%
35%
18%
10%
80
flagCanada
10%
30%
20%
30%
10