Okay, so, just from the top of my head, I think that it is because of the growing belief of "Manifest Destiny" in the nineteenth century. I'm not sure if this is the actual right answer for your question, but I do know that Manifest Destiny was in the nineteenth century and was the widely held belief in the USA that American settlers were destined to expand through out the continent. And I think both the USA and Europe wanted to expand, it was kind of a copetition/conflict they had. This was actually how Canada and Alaska came to be I believe. This was a simple explanation btw. cx
D. Whether or not fugitive slaves who escaped to free states were legally free.
Answer:
He visited the states of Southeast Asia, the coast of India, the Persian Gulf, the Red Sea, and the east coast of Africa. Zheng died in Calicut in the spring of 1433, and the fleet returned to China that summer.
I think it was China and North Korea
The best answer is:
Samuel Morse and the telegraph
Robert Fulton and the steamboat
<span>Cyrus McCormick (Inventor of the Mechanical Reaper) so its improved because he invented a better one than ones already invented
</span>hope this helped :)