The only correct answer is the first one. The Missouri compromise applied only to land that had been part of the Louisiana purchase. Sen. Jesse B. Thomas of Illinois included a compromise proviso or bargain stipulation, barring involuntary servitude from every single outstanding area of the Louisiana Purchase north of the 36° 30' parallel. Sentence 2 and 3 is false while the last sentence talks about the Fugitive Slave Act of 1850.