If you do happen to meet a fellow 'countryman' expect a great reception. American hospitality is indeed second to none, so be prepared for most employees to be very cordial. Don't be afraid to ask questions or request assistance. This is definitely the rule rather than the exception, as waiters and waitresses rely on gratuities to make their living. Don't be fooled into thinking that appetizers are light snacks, or that salads are for those with a lighter appetite.
Portions tend to be particularly generous, with doggy bags standard issue in many establishments.
Share a main course if need be, or simply ask for what's left 'to go'. Before ordering always listen carefully to your server who will reel off a list of the 'specials' on offer, and your choices of salad dressings, breads, potatoes, and vegetables. If you've never heard of a particular dish simply ask for it 'on the side' so it comes on a separate plate. The US has a huge and very varied entertainment industry with Hollywood as its hub. Movies and TV play a very important part in the lives of many Americans.