The Christian calendar was introduced in Rome only when the converted to Christianity. This system of dating is still used internationally. Using a

dating system makes it easier to mark and compare historical events.

How does the principle of federalism affect the u. s. government? a. it guarantees that the united states will always be a representative democracy b. it ensures that the state governments have greater authority that the federal government c. it creates both separate and overlapping powers for the federal and state governments d. it divides the federal and state governments into three branches