<Tr> <Td> <Ul> <Li> Federation with Ethiopia </Li> <Li> Ethiopian Annexation </Li> <Li> Eritrean War of Independence </Li> </Ul> </Td> </Tr> <Ul> <Li> Federation with Ethiopia </Li> <Li> Ethiopian Annexation </Li> <Li> Eritrean War of Independence </Li> </Ul> <Li> Federation with Ethiopia </Li> <Li> Eritrean War of Independence </Li>

What caused the axum trade empire to decline