How did Japan become the most powerful nation in Asia? Japan doubled its territory in Asia.
Japan's economy followed the US's example,
Japan adopted Western military technologies and training methods.
Japan's government made extremely wise alliances.

Japan adopted Western military technologies and training methods.

Explanation:

Before the expansion of Japan, many samurai warriors were discharged, and Japan started adopting Westerm military technologies and strategies.

Hope this helped :)

b.

explanation:

he is racist

"oh, lets coppy china and build a great wall around bla bla bla.that way,we wont lose out to other countries." in the end, he did not build anything