why were trenton,Saratoga,Valley Forge,and Yorktown was important to the war?

Answer 1

Battle of Trenton: Washington Crossing the Delaware
http://www.doublegv.com/ggv/battles/Trenton.html
http://www.patriotresource.com/battles/trenton.html

Battle of Saratoga: Decisive American Victory, France entered war on side of USA
http://www.saratoga.org/battle1777/
http://www.patriotresource.com/battles/saratoga.html

Valley Forge: Resting area for Washington's Army
http://www.nps.gov/archive/vafo/home.htm
http://www.ushistory.org/valleyforge/

Battle of Yorktown: Last major battle of Rev. War
http://members.aol.com/spursfan50/davidallen/yorktown.htm
http://www.kidport.com/RefLib/UsaHistory/AmericanRevolution/YorktownBattle.htm