Americans believe in the importance of punctuality and expect others to be on time for appointments and meetings.It is customary for Americans to hold the door open for others when entering or exiting a building.Americans value personal space and typically maintain a comfortable distance when engaging in conversations.It is considered impolite to interrupt others while they are speaking, and Americans tend to listen attentively until the speaker has finished.When dining out, Americans generally tip their servers 15-20% of the total bill as a show of appreciation for good service.Americans tend to shake hands when meeting someone for the first time as a sign of respect and goodwill.It is common for Americans to say "please" and "thank you" in social interactions as a way of displaying politeness and gratitude.