They were called Confederate Colonies, and they weremade up of emigrants from the Confederate States of America who fled the United States after the Union won the American Civil War (1861-1865). They settled in many Latin American countries like Brazil and Mexico.
No one has determined how many American southerners immigrated to Latin America, but it's said that almost 20,000 Americans entered Rio de Janeiro a couple of years after the Civil War ended. An extra fun fact: Many established small villages in Brazil with names that resembled their old hometown or state at the U.S.Some examples: America, New Texas, etc.