May is Asian and Pacific Islander American Heritage Month, a time to reflect on how these communities have shaped the history of the U.S. while also examining the struggles and discrimination they have faced in America. Erika Lee, one of the nation’s leading immigration and Asian American historians, as well as a professor of American history at the University of Minnesota, joins CBS News Asia correspondent Ramy Inocencio to discuss the concept of "Asian America" and the pivotal moments and essential lessons in history. Lee is also extensively featured in the five-part PBS docuseries "Asian Americans," which debuted this month.