That’s the Monroe doctrine, which basically said that the Americas were closed to anymore colonization from European powers.
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 :)
Answer: just look up the answers and try to answer it
Explanation:
its simple.
They had their own governer didn't they?
