What caused the Persian empire and other enemies to attack and invade Byzantium?

Before the civil war, the south’s economy was based on enslaved labor. large cities. immigrant workers. factories.

How do developments in the us space program during the ford administration reflect the foreign policy of president ford

The system of checks and balances was designed for what purpose? fear of strong state power to keep power out of one branch to appease the southern states to allow the judicial branch to have equal power