How and why did nationalism develop into imperialism?

The u.s. government has three branches: executive, judicial, and legislative. each branch plays a different role in making sure laws are passed, enforced, and applied fairly in accordance with the united states constitution. which idea does this scenario best represent?

Before becoming president, abraham lincoln participated in a series important political debates with jefferson davis andrew johnson stephen douglas andrew jackson

How were the economies of the inca empire and ancient river valley civilizations such as egypt and phoenicia different?