How were other countries pulled into the conflict between serbia and austria-hungary? what effect did their alliances have on prospects for war?

During world war 2 mexican workers came to the united states as part of the

What kind of contact did christopher columbus and native americans initially have?

How did inca develop their road system? a) they used mortar to hold the stones together.b) they built suspension bridges over rivers. c) they mixed copper and stone together to make the blocks.d) they laid roads in the cities, not in the less densely populated deserts.