The answers are:
Meriwether Lewis, William Clark and Sacagawea
Japan becoming an imperial power by establishing footholds in Taiwan and Korea.
Answer: Option 3.
<u>Explanation:</u>
Japan became an imperial power in the nineteenth century. The major reason and the factor of Japan becoming an imperial power was the war of the Sino-Japan. The war showed the power of Japan and increased it's influence because of which it could become an imperial power.
The treaty of Portsmouth, which led to the end of the Sino-Japan war, recognized Japan as a power. Because of this it had gained a territorial foothold in Manchuria. By 1910, it was able to officially annex Korea also which it had controlled de facto since the year 1905.
