Limits the amount of power each branch in the government can obtain because the biggest fear of the United States was the fear of someone or a group gaining too much power.
I believe you are referring to Ferdinand Magellan first Portuguese explorer to circumnavigate the globe
The Declaration of Independence was made so that the colonies could explain to the foreign nations why they had chosen to separate themselves from Great Britain.
Hope this helps!
The answer is A. Yuri Gagarin