They discovered that the Romans miscalculated their Persian-Sassanian opponents which caused their downward spiral, leaving them weak and allowing Islam to rise in a manner that essentially wiped out the once-powerful civilization.The two groups were at war from 54 BC to 628 for control of territories, but the Persians and Sassanians took over Roman trade routes that were critical to their victory.Without access to trade, the economy quickly collapsed and forced people in the Roman Empire to flee to other regions like Constantinople, the researchers discovered...The team analyzed shipwrecks throughout the Mediterranean from multiple sites, such as Marseille, Naples, Carthage,...