Which item is an example of a secondary source

Which describes the persian empire? choose all that are (a) the persian army defeated the athenians at the battle of marathon. (b) the persians avoided using ideas from the peoples they conquered. (c) cyrus allowed conquered peoples to keep their cultures. (d) darius i built a network of good roads for communication. choose all that are

The roosevelt corollary, issued in 1904, was a revision to what earlier statement of u.s. foreign policy?

1. what is significant about the power that russian federal cities are granted? 2. what is significant about official languages in russian republics? why would it matter?