Final answer:
Business interests, religious motivations, and the belief in American exceptionalism and democracy were among the factors that made expansion a good idea according to Beveridge's concepts.
Step-by-step explanation:
The expansion of the United States was seen as a good idea for several reasons, according to the concepts of American exceptionalism and the Progressive movement. Business interests sought new markets and resources, religious leaders aimed to spread American Christian values, and reformers believed in the spread of democracy and American virtues abroad. These motivations were combined with the changing global landscape, such as the emergence of Germany as an industrial leader and the competition among European countries for resources. The belief in an American empire and the desire to prove American might on a global stage also played a role in the push for expansion.