There speaks a true Republican! Current dynamics yes obviously, but studying the past can give insights into why many of the current dynamics exist.
I remember having a number of discussions with various people over the years about drawing a line in history regarding who were the "native" peoples of an area, and/or the "rightful" rulers.
New Zealand may be a good example here - there was a massive drive in the 70's and 80's of giving NZ "back" to the Maoris as they had been considered the indigenous population when Europeans first colonised the islands. But in fact the Maoris had only occupied NZ for around 500 years before that.
The fighting between Pakistan and India? Well the area only became known as Pakistan in 1933, at that time the area was still considered part of the Indian Empire. Pakistan only became a state in it's own right in 1947, and prior to British rule had been included in many different empires and states. Without understanding the history of the preceding few hundred years both political and religious, it would be very hard to understand the current conflicts there.
Putin is trying to recreate the old Soviet Union. Current situation is a large number of independent countries with full self determination. If you consider any time between 1922 and the fall of the Soviet Union as "current", then he has every right to "take back" countries that were under their control. Go back just 5 years from then and Russia was ruled by the Tsars, and for 500 years before that - is that "current"?
In the present day we have the freedoms in most Westernised countries to follow whichever religion we want, but in the past your religion could be determined by the monarch. Tudor monarchs are a classic example of this. Henry VIII was Catholic through and through - he wrote pamphlets supporting the Pope and was apparently well versed in the doctrines. But his need for a male heir and his head being turned by a younger woman led to the creation of the CoE, and various other countries around northern Europe were turning to Protestantism at the same time.
Edward VI was brought up Protestant and was very devout. Then he died and Mary came to the throne, Catholic and determined to turn England Catholic again and by force if necessary. Then Elizabeth, Protestant again, going back the other way. One of the reasons why she wouldn't name Mary Queen of Scots her heir is because Mary was Catholic - no issues with James, who was a very devout protestant.
TL:DR History going back centuries, and monarchs of those days, have influenced where we are now politically and without understanding those influences we can't truly understand the modern dynamics