What motivated christopher columbus to find a shorter and more efficient sea route to asia?

Why did jefferson make the louisiana purchase?

The internal combustion engine was an innovation of

Why did un coalition troops battle iraqi forces in 1991? iraq had invaded saudi arabia, along with its other border nations.iraq had invaded kuwait, which was a major source of the world's oil.the united nations wanted to remove saddam hussein from power.the united nations wanted to prevent the trade of illegal drugs.