Which of the following is not a power of the united states congress?
a. enforcing immigration laws
b. regulating commerce between the states
c. levying and collecting taxes
d. establishing and paying for the armed forces

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.