Answer:
It was David Livingstone who was the first to cross the African continent. He did so under great amounts of danger and would eventually die a mysterious death in Africa.
Explanation:
there then
 
        
             
        
        
        
The Mississippi was used for transportation and their were ports along it before the LA purchase
        
             
        
        
        
Answer:
What are the three principles of the people?
 The three principles of the people are :nationalism, democracy, and the livelihood of the people. 
This ideology was developed by  Sun Yat-sen to create  prosperous nation.
 Are these realistic in China?
No.  China has a massive authoritarian power structure, in which the government owned almost all the resources in the country.  The people do not obtain the right to free election, which do not fulfill the 'Democracy' Criteria from the three principles.
How about in today's world?
Absolutely. Those three principles are generally popular among the citizens, it should not be difficult to achieve.
Probably the biggest challenge for any other country in the world would be fulfilling livelihood of the people.
But it can be solved by having emphatic understanding toward the hardship that felt by our fellow citizens.
 
        
             
        
        
        
We can protest in order to be heard or put posters around to spread the idea of togetherness. We can use propaganda to further support our claim and ask other big corporations to help support our cause.
I hope this helps and works for you
        
             
        
        
        
It’s both true and false but for school true