Final answer:
Some European nations objected to the Gregorian calendar due to religious and political reasons, as the reform was seen as a Catholic initiative. Protestant nations resisted adopting it to avoid aligning with the Catholic Church.
Step-by-step explanation:
The objection to the Gregorian calendar by some European nations can be traced to religious and political reasons. When Pope Gregory XIII introduced the Gregorian calendar in 1582, Catholic countries immediately adopted it. However, countries of the Eastern Church and most Protestant countries did not adopt it until much later. England and the American colonies made the change in 1752. The objection stemmed from the fact that the calendar reform was seen as a Catholic initiative, and some nations, particularly Protestant ones, resisted adopting it as they did not want to be seen as aligning with the Catholic Church.