What geographical advantages did the river valley civilizations have over the Mesoamerican civilizations? Choose two correct answers.
less coastline
narrower landforms
larger river systems
fewer geographic barriers
more jungles and wetlands

Which of the following was an effect of allied defeats and high casualty rates on the eastern front? the united states issued the fourteen points. russia entered the war on the allied side. the united states entered the war sooner. russia experienced a revolution and dropped out of the war.

How did german physicist werner heisenberg's uncertainty principle shake beliefs in newtonian physics?

Nationalsim led to major conflicts following world war1 especially when