Which theme best describes american history in until 1877

Which factor has played the most important role in changing the way history is studied over time?

Why was america’s victory at yorktown among the most significant battles of the american revolution? a. it made the british realize they were fighting a lost cause and soon after, they conceded the war. b. it forced colonists who had so far remained neutral to pick a side and enlist in the war. c. it the continental army remove all british barracks from new jersey. d. it secure france’s military and financial aid for the american cause. e.

Examine the air pressure map. which type of line is shown on the map?