Answer: open new markets.
Explanation:
The greatest priority of western railroad development as illustrated above was to open new markets.
Connecting the coasts made exportation easier to the Eastern markets. The development of the railroad also brought about new economic opportunities and new territories were also easily accessible.
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They would not pay taxes on their tea, plain and simple. The Boston Tea Party is also important because of both the British and American responses to the actions that followed the tea party.