What is important about the progressive dates on the map?

The important thing about progressive dates on the map is to know the exact date on when the activity will be held.

president jefferson protested this interference in american trade. he sent james monroe to london to negotiate a treaty. jefferson wanted britain to stop taking sailors from american ships, and to stop interfering in the trade of neutral nations. monroe tried many times to discuss such an agreement. but the british foreign minister was always too busy to see him.

explanation:

four sitting presidents have been assassinated while in office but the first was abraham lincoln,