This collection of original papers presents current research on linguistic aspects of the Spanish used in the United States. The authors examine such topics as language maintenance and language shift, language choice, the bilingual's discourse patterns, varieties of Spanish used in the United States, and oral proficiency testing of bilingual speakers. In view of the fact that Hispanics constitute the largest linguistic minority in the United States, the pioneering work in the area of sociolinguistic issues in the U.S. Spanish presented here is of great importance.