This book, by William Clark Griggs, focuses on Frank McMullan's post war Confederte colony in Brazil. The 152 person colony was short lived, but they left a mark on Brazil,including the fact that the Texans in the colony introduced the mouldboard plow into Brazil, which had a huge impact on Brazilian agriculture. Another Confederate impact on Brazil was the introduction of the Baptist Religion in Brazil, Baptists became the largest Protestant denomination in Brazil. I found it an interesting and worthwhile read,sort of an epilogue to the Civil War.
Very well researched and with extensive end notes.
The lands ceded to the McMullen colony were between the towns of Periube and Connceicao - nearly 500 square miles.
It was later groups of emigrants, led by Charles Nathan, Ballard Dunn, George Barnsley and others, who joined Americans at a place known then as Santa Barbra,in a district of San Palo. In 1904 it was determined that the name of the district should be changed to reflect the original settlers. Santa Barbara was re-named Distrito de Paz de Vila Americana - or simply Americana.
So to answer the question asked, no, the McMullan colony was not the colony known as Americana, although some members of the McMullan colony did move into that colony.
Americana, in San Palo, was founded after the McMullan colony.