How did the crusades promote the exchange of ideas and goods?

After ww2, the soviets began setting up what type of governments in countries closest to them

The idea of manifest destiny simply stated it was america's destiny to expand from the atlantic ocean to the pacific. the word "destiny" implies an idea that it was within our rights as a nation to expand. in a paragraph of 125+ words, explain what could be wrong with that idea.

Why did alexander go primarily east and south from macedonia and greece in his conquest