19. What was one reason Japan attacked the U.S. naval base at Pearl Harbor? The Japanese naval fleet had Midway. Japanese Americans had been US. trade sanctions had caused The U.S. strategy of island hoppin routes.

## Step 1<br />The question is asking for the reason why Japan attacked the U.S. naval base at Pearl Harbor. The options provided are:<br />- The Japanese naval fleet had Midway.<br />- Japanese Americans had been US.<br />- US. trade sanctions had caused routes.<br />- The U.S. strategy of island hopping.<br /><br />## Step 2<br />The correct answer is "US. trade sanctions had caused routes." This is because the U.S. had imposed trade sanctions on Japan, which severely affected Japan's economy and military capabilities. This led Japan to believe that they needed to secure resources in Southeast which were under U.S. influence.<br /><br />## Step 3<br />The other options are not correct because they do not accurately describe the reasons for the attack on Pearl Harbor. The Japanese naval fleet having Midway, Japanese Americans being US, and the U.S. strategy of island hopping are not the reasons why Japan attacked the U.S. naval base at Pearl Harbor.