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Number 2, Example A: Checks and balances: Example B: Separation of powers.

Explanation: Since congress has to pass laws that are given to them or proposed, and the Supreme Court can invalidate laws that violate the constitution, its a system of checks and balances and separation of powers. The separation of powers comes from the fact that only congress can pass new laws. The Supreme Court, judicial branch, et cetera cannot pass laws.

the court ruled that a state law that banned abortions (except to save the life of the mother) was unconstitutional

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in the 1800s, locomotives powered by steam made transportation faster and cheaper. the resulting rapid growth of railroads led to the connection of the atlantic and pacific railroad in oklahoma city in 1897.

in the last years of the century, the improvement of steam-based engines the expansion and growth of railroads. this growth increased when the companies started to build and expand, such as the atlantic and pacific railroad, which connected new mexico with california, and missouri with oklahoma. many of these new networks were built in oklahoma, and these changes transportation henceforward.