Americans tend to require more personal space than in other cultures. If you try to get too close to an American during your conversation, he or she will feel that you are “in their face” and will try to back away. Try to avoid physical contact while you are speaking, since this may lead to discomfort. Touching is a bit too intimate for casual acquaintances. On the other hand, Mexicans might require an arms length or less. Although, this might vary according to religion, the Mexican region you are, gender, etc. The English tend to keep about an 2-3 feet between them while speaking. Canadian people, as well as English or Americans, value their personal space and tend to be comfortable with 2-3 feet of personal space during conversations.