Bonjour,
Extrait du site de l'US Customs :
http://www.foreignborn.com/visas_imm/entering_us/3customsinfo-nonres.htm#alcoholicAlcoholic Beverages
Nonresidents who are at least 21 years old may bring in, free of duty and Internal Revenue Tax, up to one liter of alcoholic beverage--beer, wine, liquor--for personal use. Quantities above the one-liter limitation are subject to duty and internal revenue tax.
In addition to federal laws, you must also meet state alcoholic beverage laws, which may be more restrictive than federal laws. This means that if the state in which you arrive permits less liquor, wine, or beer than you have legally brought into the United States, that state's laws apply to your importation of alcoholic beverages for personal use.
Je crois donc que tu peux oublier toute idée de "caisses" !!
Pour te "rassurer" : on trouve dans les boutiques adhoc là-bas un assez bon champagne, à un prix inférieur à celui importé, appelé "Chandon".... puisque fait en Californie par la société Moet & Chandon bien connue !!
A la tienne !!