The correct answer to this open question is the following.
The Meaning of this picture and what this political cartoon says about Imperialism is that it refers to the Rudyard Kippling idea of the "White Man's Burden." He wrote the famous poem "The White Man's Burden."
The poem refers to the War of 1899 between the United States and the Philippines. Kipling supported with his poem the imperialistic ideas of the United States and the annexation of the Philippines. Kipling thought that the American white men had the right and the moral obligation to educate other races. However, he considered that non-white peoples such as the Philippines would not be grateful after the help of American whites.
That is why in the cartoon, the author depicts a couple of white men, one of them dressing like Uncle Sam, carrying big baskets full of black people, representing other nations.
At that time, Europeans sadly believed that they were a more evolved race who deserved to take over others. That is why Social Darwinism is considered to be imperialistic and racist.
So as part of imperialistic ideas, white people living in European nations or in the United States, believed that they had the right to colonize and conquer less developed territories and govern these native people.
