The December 7th, 1941 Japanese attack on Pearl Harbor was a surprise military strike conducted by the Imperial Japanese Navy against the United States naval base at Pearl Harbor, Hawaii. The attack led to the United States' entry into World War II. The surprise nature of the attack, and the significant damage inflicted, led to a significant shift in American public opinion, and led to the United States' declaration of war on Japan the next day.

The Japanese launched a series of attacks in the Pacific during World War II, including the surprise attack on Pearl Harbor on December 7th, 1941. This was followed by the invasion of the Philippines, Guam, Wake Island, and the British colonies of Malaya and Singapore. The Japanese also launched a major offensive in the Dutch East Indies (Indonesia) and targeted Australia with bombing raids. The Japanese military also made significant advances in the early years of the war, capturing many islands in the Pacific and Southeast Asia.

The attack on Pearl Harbor by Japan on December 7, 1941 had significant effects on British Columbia, Canada. One of the most immediate effects was the fear of a potential Japanese invasion on the West Coast of Canada, which led to increased military presence and fortifications in the area. Additionally, many citizens of Japanese descent were interned or forced to relocate to internment camps in the interior of British Columbia. The attack also led to increased anti-Japanese sentiment among the population, and a general sense of fear and uncertainty. The attack also led Canada to declare war on Japan and join the Second World War.

The attack on Pearl Harbor led to the mobilization of Canadian armed forces, including those in British Columbia. Canada declared war on Japan on December 8, 1941, one day after the attack on Pearl Harbor, and immediately began to increase its military presence on the West Coast of Canada to protect against a potential Japanese invasion.

The British Columbia coast was heavily fortified with bunkers, artillery batteries, and other defensive structures, and a large number of troops were deployed to the region to man these defenses. The Royal Canadian Navy also increased its presence in the area, with many ships being sent to patrol the coast and protect against any potential Japanese attacks.

Additionally, many men from British Columbia and the rest of Canada enlisted in the armed forces to fight in the Second World War, with many of them being sent to fight in Europe and other theaters of the war. The war effort also led to increased industrial production in British Columbia to support the military. This led to a decrease in the unemployment rate and an increase in economic activity in the region.