We investigated drinking behavior and sources of alcohol among Native American  and White youths, as well as how underage drinking behavior and sources of  alcohol may be related to environmental factors.
Survey data from a  sample of 18,916 youths (8th, 10th, and 12th grades) from Montana were analyzed  using hierarchical linear modeling. Survey data were supplemented with  county-level economic and census data.
Native American youths were more  likely than White youths to report drinking and heavy episodic drinking and  initiate drinking at a younger age. 
Native Americans were less likely than  Whites to get alcohol from home or from someone younger than age 21 but were  more likely to get it from other social sources or through theft from a store. 
Living in a county with more Native Americans was inversely related to access to  alcohol for both White and Native American youths, as well as reduced lifetime,  30-day, and heavy episodic drinking. Living in a county with more single-parent  households was positively related to lifetime drinking, 30-day drinking, heavy  episodic drinking, and increased access to alcohol through someone younger than  age 21 or a stranger. 
Median income was negatively related to lifetime drinking  and ease of access to alcohol and was positively related to accessing alcohol  from home without permission, theft, or purchase with a fake ID. 
Because Native American and White youths have different drinking patterns and  obtain alcohol from different sources, strategies to prevent alcohol problems in  these groups should take these differences into consideration.
 
