On April 4, 1949, Canada became a founding member of the North Atlantic Treaty Organization (NATO) by signing the North Atlantic Treaty. This military and political alliance was established to safeguard the freedom and security of its member countries through collective defense. Wikipedia+2Government of Canada+2The Canada Guide+2
Additionally, on April 4, 1942, during World War II, a Royal Canadian Air Force plane spotted the Japanese fleet en route to Ceylon (now Sri Lanka). The timely warning allowed for the successful defense of the island, an event Winston Churchill referred to as “the most dangerous moment of the war.” Veterans Affairs Canada
Furthermore, on April 4, 1986, the town of Port Simpson in British Columbia was officially renamed Lax Kw’alaams, reflecting its Indigenous heritage. Wikipedia
These events highlight significant moments in Canada’s history that occurred on April 4.

![Soon after liberation, surviving children of the Auschwitz camp walk out of the children's barracks. [LCID: 70262] Soon after liberation, surviving children of the Auschwitz camp walk out of the children's barracks. [LCID: 70262]](https://encyclopedia.ushmm.org/images/large/50083758-e1cc-458c-86a0-173b2f517d99.jpg)
![Hungarian Jews on their way to the gas chambers. Auschwitz-Birkenau, Poland, May 1944. [LCID: 77356] A crowded line of women and children. Most are wearing patches of the Star of David pinned to their heavy coats.](https://encyclopedia.ushmm.org/images/large/8065f88e-ade8-4e12-824b-496212df38b1.jpg)
![A transport of Jews from Hungary arrives at Auschwitz-Birkenau. [LCID: 77354] Several people exit a cattle train car. Most are wearing heavy coats, hats, and other outerwear. A few people can be seen wearing Star of David patches.](https://encyclopedia.ushmm.org/images/large/d960bfcc-accb-4773-b62d-e92df1770d93.jpg)
Identification pictures of a Jewish inmate of the Auschwitz camp. Poland, between 1940 and 1945.![Identification pictures of a female inmate of the Auschwitz camp. [LCID: 90354] Identification pictures of a female inmate of the Auschwitz camp. [LCID: 90354]](https://encyclopedia.ushmm.org/images/large/3a4e6972-13a1-4b5c-823c-8e8f63495b55.jpg)