The article reviews studies on how large waves of less-skilled immigrants affect wages in the US. It shows that these surges can lead to small decreases in wages for less-educated workers, especially foreign-born and less-educated African-Americans in areas with many immigrants. The data is not perfect, as many new immigrants work off the books. While some people benefit from this immigration, others lose out. The article suggests that policies are needed to make sure that all workers, whether born in the US or not, are paid fairly and have good working conditions.