What was the immediate cause of the u. s. entry into wwi?

The claim of papal supremacy held that the pope had authority over all religions on earth. the pope was the chief authority over the papal states. the pope had authority over all kings and emperors. the pope was the head of the western christian church.

Was the battle of iwo jima over after us troops raised the flag on mt. suribachi?

How did the byzantine culture influence russia?