From what I can recall, the Adams-Onis Treaty more or less gave Florida to the U.S. but it did not exactly end the Second Seminole War, which can be made obvious with the fact that there are Seminoles still living in Florida. I don't remember the Treaty having anything to do with the British since this treaty was between Spain and the U.S.
Basically, I believe the answer is B.
delegates in Philadelphia to write a new constitution
I believe A. I am not 100% sure but that is my best guess.
Gulf of Saint Lawrence
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Some of the causes were: overproduction by farmers, consumerism (prioritizing spending above saving), speculation in the stock market, and uneven distribution of wealth.