Why was the Avro Arrow of F106 Delta Dart cancelled?

The Avro Arrow was cancelled primarily due to escalating costs, shifting political priorities, and the changing landscape of military aviation during the Cold War. The Canadian government, facing budget constraints and the need to align with U.S. defense policies, opted to abandon the project in 1959. Additionally, advancements in missile technology diminished the relevance of manned interceptor aircraft, leading to the decision to focus on other defense initiatives. The F-106 Delta Dart, while initially seen as a competitor, was ultimately selected for its more immediate availability and lower costs.