Much of the information has been obtained from Genocides in History @ Wikipedia.
Link: Genocides in History.
Genocide is the deliberate and systematic destruction, in whole or in part, of an ethnic, racial, religious or national group. The term was coined in 1944 by Raphael Lemkin. It is defined in Article 2 of the Convention on the Prevention and Punishment of the Crime of Genocide (CPPCG) of 1948 as "any of the following acts committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such: killing members of the group; causing serious bodily or mental harm to members of the group; deliberately inflicting on the groups conditions of life, calculated to bring about its physical destruction in whole or in part; imposing measures intended to prevent births within the group; [and] forcibly transferring children of the group to another group."
The preamble to the CPPCG states that "genocide is a crime under international law, contrary to the spirit and aims of the United Nations and condemned by the civilized world" and that "at all periods of history genocide has inflicted great losses on humanity."
Determining what historical events constitute a genocide and which are merely criminal or inhuman behavior is not a clear-cut matter. In nearly every case where accusations of genocide have circulated, partisans of various sides have fiercely disputed the details and interpretation of the event, often to the point of depicting wildly different versions of the facts.
Most people think of Adolph Hitler and the Third Reich, under The Holocaust.
But the U.S.A. has a very detailed history listed under 220.127.116.11. It was committed against indigenous American Indians by the U.S. Military.
Some people may say that the United States has committed genocide against Cuba, after the triumph of the Cuban Revolution on January 1, 1959. (Embargo/Blockade by Yankee Imperialism.)
In my non-expert opinion, I say that the U.S.A. ought to be expelled from the General Assembly of the United Nations, for all the crimes it has committed against the Cuban People since 1959.
See also: 1 November 2018:
General Assembly Adopts Annual Resolution Calling for End to Embargo on Cuba, Soundly Rejects Amendments by United States
Cuba’s Minister for Foreign Affairs Bruno Eduardo Rodríguez Parrilla, who introduced the text, said the human damage caused by the United States‑led blockade against his country qualifies as an “act of genocide” and creates obstacles for cultural, academic and scientific engagement throughout the island.
Related: Wikipedia: United States embargo against Cuba