The answer for #2 - The Republic of West Florida was a short-lived republic in the western region of Spanish West Florida for several months during 1810. It was annexed and occupied by the United States later in 1810 and is today an eastern part of the U.S. state of Louisiana.
The answer for #3 - One main reason why white Southerners were angry and frustrated about Spain holding most of Florida is because this meant less land that they could use for farming.
Answer for #4 - The word Seminole is derived from cimarrón, a Spanish term for "runaway" or "wild one", historically used for certain Native American groups in Florida. The people who constituted the nucleus of this Florida group either chose to leave their tribe or were banished.
I don't know the answer to number 5, sorry. Hope this helps!