Answer: To mark historical moments in are society, so that we can know when they happened hopefully preventing anyone from distorting information.
The completion of the Transcontinental Railroad greatly affected companies that made products in that it made it far easier for them to transport their goods over long distances to markets, which greatly increased profits and output.
On vacation...............
Once you start your 2nd paragraph giving evidence to support your claim you then do a counterargument paragraph
It allowed books (ideas) to be printed en masse. Reformation vouchers were able to spread their ideals to many readers, causing many to be won over by their words. In essence, they outpaced their competitors.