All positive solutions, including zero:
2x - 1 < 3
2x < 4
x < 2
solutions (integers): 0 and 1
All negative solutions:
2x - 1 < -3
2x < -2
x < -1
Since the question is asking you for solutions that are non-negative integers, the answer is 0 and 1.
The purpose of the Missouri Compromise was to keep a balance between the number of slave states and the number of free states in the Union. It allowed Missouri to enter as a slave state at the same time Maine entered as a free state, thus maintaining a balance in numbers of free and slave states.
The Federal Reserve
The Federal Deposit Insurance Corporation