What calendar has the highest number year

Gregorian calendar

Explanation:

The Gregorian calendar is the calendar used in most of the world. It is named after Pope Gregory XIII, who introduced it in October 1582. The calendar spaces leap years to make its average year 365.2425 days long, approximating the 365.2422-day tropical year that is determined by the Earth's revolution around the Sun.

albany plan of union, 1754. the albany plan of union was a plan to place the british north american colonies under a more centralized government

by improved communication.