What is imperialism? What are the bad effects of imperialism in the rest of the world?

Imperialism is defined as forcefully imposing the rule and/or influence of a stronger nation over a weaker one. This control can be done economically, through military might, or political control. The word shares the same latin root as “empire”; imperialism is the expanding of an empire.
Many have argued that the very nature of imperialism is contrary to the free will and basic rights of all human beings. When people are forced to live under foreign rule, they have little to no say in how their lives and communities are governed. This was quite evident in the Soviet “satellite states” during the Cold War. Ukraine was essentially forced into a famine by Joseph Stalin, leaving the people to eat grass, vermin, rats, frogs, and even the corpses of those who had died during the famine.
The United States participated in what was known as the “Age of Imperialism” in the late-nineteenth and early-twentieth centuries. After winning the Spanish-American War, the US became responsible for a variety of island nations in the Caribbean and the Pacific Ocean. A defining philosophy of this era was called the “White Man’s Burden,” based on a poem of the same name by author Rudyard Kipling. The piece encouraged white people to go and conquer remote civilizations in order to teach them how to live by modern, westernized standards. This demonstrates that a sense of racial superiority is often a motivation for a country and its citizens to participate in imperialism.
Other negative effects of imperialism include mass genocide and subjugation, as occurred when European powers first began landing in South and Central America. A striking example of the horrors produced by imperialism would be the Nazi expansion and domination of Europe in the 1930s and 1940s. Disease, hunger, slavery, and death are all documented byproducts of imperialist rule throughout human history.
http://www.historywiz.com/primarysources/marktwain-imperialism.htm

https://www.mtholyoke.edu/acad/intrel/pol116/imperial.htm