An influx of immigrants has sparked diversity and more multiracial marriages in America, according to a Brookings Institution article that notes whites are the most likely partner. William H. Frey adapted the data from his book "Diversity Explosion: How Racial Demographics Are Remaking America." In his blog post, the demographer notes that the vast majority of American Indians who marry wed someone of another race — and often individuals who call themselves multiracial, "signaling an extensive blurring that has already occurred among American Indian and white populations."