With over a billion people and many who speak English there is a tremendous market for US businesses. Following some etiquette rules of doing business will start you in the right direction.
.Men are expected to wear a suit & tie for business
.Women should wear long pants or dresses
.The use of leather products belts or handbags may be considered offensive
.Never's touch someone else's head, adult or child
.Standing with your hands on your hips will be interpreted as an angry or aggressive posture
.Never point your feet at another person, they are considered unclean
.Gifts are not opened in the presence of the giver
.Business lunches are preferred over dinners
.Never directly refuse an invitation, use evasive refusals or "I'll try"