Short answers, pulled from the story.
The North Atlantic Treaty Organization was founded on the 4th of April 1949 when twelve nations signed the treaty in Washington. The original members included the United States, Canada, the United Kingdom, France, and Italy among others. These twelve countries established the alliance to provide collective security and deter Soviet aggression.
Article 5 of the North Atlantic Treaty Organization charter legally defines an attack on one member state as an attack on all. This principle serves as the cornerstone of the alliance's collective defense commitment. The provision was invoked for the first time on the 4th of October 2001 following the September 11 attacks in the United States.
The North Atlantic Treaty Organization currently has 32 member states committed to the principles of the North Atlantic Treaty. Finland joined the alliance in 2023 and Sweden joined in 2024 following the Russo-Ukrainian war. These two Nordic countries abandoned their neutral status to become the newest members of the organization.
The North Atlantic Treaty Organization headquarters are located in Brussels, Belgium serving as the administrative and political heart of the alliance. The North Atlantic Council serves as the primary decision-making body and convenes at least once a week to take major decisions regarding NATO policies. Action within the council is agreed upon by consensus while each state retains complete sovereignty.
NATO member states aim to spend at least 2 percent of their gross domestic product on defense as agreed upon at the 2014 Wales summit. A record 23 of 32 NATO member states met their defense spending targets of 2 percent of their country's GDP in 2024. Countries such as Spain, Luxembourg, Slovenia, Belgium, Canada, Italy, Portugal, and Croatia did not meet the 2 percent contribution goal in 2024.