How did greece influence american government?

Why is it useful for historians to base certain studies on the analysis of historical periods

Examine these two paintings that depict famous events from american history. the image on the left, painted in 1940, shows the signing of the u.s. constitution in 1787. the image on the right, painted in 1836, shows the american victory at the battle of yorktown in 1781.which of these paintings should be considered a secondary source?

Why did the collapse of the soviet union and the power vacuum in the balkans lead to bosnian genocide?