This difference in distribution of free blacks persisted until the Civil War.

However, cultural differences and even rivalry would persist until the later 1900s.

Nevertheless, differences persist over how to make the economy grow.

The students in small classes performed better - and the differences persisted long after fourth grade.

So the differences persist longer and are fought out with greater determination.

Although life expectancy has increased for all groups, differences persist.

More than a century later, the difference persists in almost the same magnitude.

These differences and the sense of segregation persist to the current day.

However, he found that differences in speech persisted as an indicator of social class, age and gender.

The difference in returns persists even if one looks at subsamples.