WASHINGTON – U.S.-born children of Hispanic immigrants are more likely than their parents to identify themselves as Democrats as they integrate into American life, maintaining strong ties to their cultural heritage while casting themselves as liberal on social issues.

A study released Thursday by the Pew Research Center lays bare some of the difficulties for Republicans after elections last November, when President Obama won with support from 80 percent of nonwhite and ethnic voters. The report tracks the socioeconomic progress and views of second-generation Americans, the bulk of them Latinos and Asians who were born in the United States after a 1965 immigration law opened U.S. borders.

“What’s striking over the past several decades is that the two groups at the heart of the modern immigration wave — Hispanics and Asian-Americans — have both been trending Democratic over time, as they sink their roots deeper into American society,” Paul Taylor, Pew’s executive vice president, said in an interview.

“Many decades ago, Ronald Reagan is said to have described Hispanics as ‘Republicans who don’t know it yet.’ Well, it’s 2013, and they apparently still haven’t figured it out,” he said.

The report says adult children of immigrants as a group are integrating into U.S. society and doing generally better than newly arrived immigrants in median income, educational attainment and English fluency. The second-generation group also reports increased social ties, including intermarriage, with other racial and ethnic groups.

About 60 percent of Hispanics and Asians in the second generation consider themselves to be a “typical American,” roughly double the share of first-generation immigrants who think so. At the same time, however, the second-generation groups maintain strong ties to their ancestral roots in an increasingly multicultural United States, with majorities identifying themselves by their family’s country of origin, such as Mexican-American, or by a pan-ethnic label such as Asian-American.

The study is based on Pew’s analysis of census data as of March 2012, as well as prior years, supplemented with data from Pew polls including the 2011 and 2012 National Survey of Latinos and the 2012 Asian-American Survey.