Following prolonged tensions between Japan and the Western powers, units of the Imperial Japanese Navy and Imperial Japanese Army launched simultaneous surprise attacks on the United States and the British Empire on 7 December (8 December in &lt;a href="Asia-Pacific"&gt;Asia/West Pacific&lt;/a&gt; time zones). The locations of this first wave of Japanese attacks included the American territories of Hawaii, the Philippines, Guam, and Wake Island and the British territories of Malaya, Singapore, and Hong Kong. Concurrently, Japanese forces invaded southern and eastern Thailand and were resisted for several hours, before the Thai government signed an armistice and entered an alliance with Japan. Although Japan declared war on the United States and the British Empire, the declaration was not delivered until after the attacks began.