whAt is thE mAin topiC oF this pAssAgE
A．sir williAm johnson's rolE in ColoniAl AmEriCA.
B．thE trADE pAttErns oF thE iroquois nAtion.
C．sir williAm johnson AnD thE AmEriCAn rEvolution.
D．thE British-FrEnCh ConFliCts in thE 1700's.