As the U.S. population has become increasingly diverse--a continuing trend led by children--there has been an accompanying rise in the number of children who grow up hearing and learning more than one language. Dual language learners represent an important asset for our nation's future, since those who have fluency in more than one language have access to a broader, and generally higher-paid, set of job opportunities. Moreover, children who are bilingual reap benefits in multiple developmental areas: cognitive, social, and emotional. However, these opportunities can go unrealized when schools and other social institutions lack the understanding required to respond sensitively to the particular needs of dual language learners. This brief compares national trends over time in academic achievement for students who are English language learners (ELLs) and their peers who are not English language learners. The measures used are from the National Assessment of Educational Progress (NAEP): the percentage of fourth-graders scored as performing at a "basic or above" level in reading, and the percentage of eighth-graders scored as performing at a "basic or above" level in mathematics.