<span>Led to the transatlantic slave trade</span>
The Japanese attacked Pearl Harbor to weaken/neutralize the U.S. Pacific Navy in doing so it allowed for Japan to continue in its process in getting natural resources from Malaya and the Dutch East Indies. (oil, rubber)
THIS IS YOUR OPINION BUT AGREE
Levers don't have a lot of moving parts, so they don't generate as much friction as other machines do.