Under nato, the united states, canada, and western european nations agreed to

Under NATO, the United States, Canada, and Western European nations agreed to defend each other against attacks by responding with force.

The North Atlantic Treaty Organization is a military alliance currently consisting of 29 independent countries from North America (the U.S. and Canada) and West Europe; it aims to ensure collective armed defense and mutual protection in the case of any external party's armed attack. It was established in the North Atlantic Treaty on April 1949.

yes

explanation:

why

sorry i really dont know