I can think of several.
What are your choices? What does your book say?
These are the examples given in my textbook are the following:
1. Linked the economies of the West and East.
2. Helped people settle the West.
3. Weakened the Native American hold on the West.
4. Gave people more control of the environment.
That looks good to me.
You could substitute for 2 the transportation of goods from west to east and vice versa.
Number 3 is no longer relevant.
It also mentions standard time.
Am I to included it?
I don't think standard times is relevant to railroads today.
But my textbook states, "To solve the issues of solar time, railroad companies set up standard time."
...Are you certain?
I just reread your original question. Yes, standard time zones should be included.
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