A war between two US allies is a matter of A - foreign policy B - domestic policy

Correct answer:

A - foreign policy

Explanation:

Foreign policy refers to a country's relationships and actions with other countries. "Foreign" means that it has do with countries outside of the United States. So if two US allies become embroiled in a war with each other, that pertains to US foreign policy - - dealings with other nations.

Domestic policy refers to a country's programs and actions within its own borders. "Domestic" stems from the Latin word "domus" which means "house." So "domestic" affairs are those matters taking place inside your own "house" - - or in the case of a nation, inside your own nation.