As I am thinking you mean "Producers" when you say "Sellers" I am going to go with, Yes. You are correct it is Supply.
(Also the other one is called Demand not price)
3 main reasons for imperialism:
raw materials:caused imperialism because nations wanted to gain raw materials for their newly developed factories
manufactured goods:caused imperialism because nations wanted to gain markets to sell their goods
white man's burden:caused imperialism because nations felt it was their duty to "civilize" the nations in Africa and Asia
Reasons against imperialism:
hypocrisy, America claims government to be chosen by the people
America will now be involved in Asian conflicts
The Chinese, The Soviet Union, and North Korea
They were drastically different. Hopes this helps
