Something I noticed between Mullatos and Eurasian

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I hope I wont offend people with this discussion When you say Mullato its a biracial person who is half White Half Black, When you say Eurasian, Its a person who is half asian,half Caucasian. I noticed that people of Caucasian and black decent, even if ther were only 1/4 black, they will be seen as black. some of them identifies mixed but usually they just choose the identity Black on their census. I heard most biracial peopleof Caucasian and African decent in USA identifies as black. It seemed to be a different case with Eurasians, some of them identify as White,some of them Identifies as Asian,some identifies as mixed, some example: keannu Reeves is part Chinese but he seemed to identify as White. Kelly Hu who is also Eurasian seemed to identify as Asian, While Kristin Kreuk who is part Swedish,Chinese and Indonesian seemed to identify as mixed. I know many mixed people grew up with identity crisis on what ethnicity is while others directly chose 1 or identified as mixed. Why do you think most Mulattoes identify as Black while Eurasians seemed to have a choice whether they want to be white,asian or mixed?