More on the historical illegality of Markle, a mix raced person, existing in the white settler entity america.
https://en.wikipedia.org/wiki/Interracial_marriage
The first anti-miscegenation law was passed by the Maryland General Assembly in 1691, criminalizing interracial marriage. A belief in racial purity and white supremacy were among the reasons for such laws, with Abraham Lincoln stating in an 1858 speech:
"I am not, nor ever have been in favor of making voters or jurors of negroes, nor of qualifying them to hold office, nor to intermarry with white people. I as much as any man am in favor of the superior position assigned to the white race."
Although the ban on interracial marraige ended in California in 1948, entertainer Sammy Davis Jr. faced a backlash for his involvement with a White woman in 1957. In 1963, when asked by a reporter if interracial marriage would become widespread in america, Harry S. Truman responded, "I hope not; I don't believe in it. Would you want your daughter to marry a Negro? She won't love someone who isn't her color."
Interracial marriage only became legal nationwide in america in 1967. Markle was born just 14 years later.