In the States, teams are groups of individuals brought together for the moment to complete a given task or project.
During the period that the group is together, everybody is expected to be fully committed to the common goals and to work with dedication and purpose to ensure that those goals are achieved. It is important to show enthusiasm for the project and to show belief in the ultimate achievement of the objectives. Old World cynicism is not really appreciated or understood.
When the project is complete, the team will rapidly dissipate; its members moving on the next task with equanimity. To break up a team in the fluid employment environment of the USA is less traumatic than in other group-oriented cultures where identity is subsumed to the group. In the States, teams are expected to be transitory in nature.