Through The Adams-Onis Treaty of 1819 (aka The Transcontinental Treaty, The Florida Purchase Treaty or The Florida Treaty).
The correct answer is convert to
If you expand then you just take the territory and add it to your empire which happened during the growth of Islam even when locals wouldn't become Muslims themselves. The spread of Islam happened when the local population would convert to Islam which happened in many parts of Africa and even Europe.
Measures taken by groups such as the United Nations to try to prevent genocide following World War II included making the crime of genocide punishable under international law. The United Nations approved its Convention on the Prevention and Punishment of the Crime of Genocide (CPPCG) in 1948 which was later on ratified by more than 130 countries. However, this did not prevent future genocides such as in Yugoslavia and Rwanda
White landowners who could make those African Americans work for them
