Between 2000 and 2010, the percentage of americans identifying as more than one race on the census increased by

About 6%

Explanation: Over the course of a decade, about ten million Americans changed the way they identify themselves ethnically or racially. That is the main conclusion of a study that compared the information that 168 million people filled in the 2000 and 2010 censuses. Some reason why Americans did this changes were, mainly, personal decisions or government benefits.

answer; cultural trait;

answer; the edward snowden leaks of nsa classified material;