What is the official name for the group of people who worked with the U.S.?

The official name for the group of people who worked with the U.S. is often referred to as "U.S. allies" or "coalition partners," depending on the context of their collaboration, such as military, diplomatic, or economic efforts. In specific historical contexts, they may also be called "co-belligerents" or "partner nations." In the case of intelligence operations, they might be referred to as "intelligence partners."