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The period between the foundation of the Han dynasty and Wang Mang's reign is known as the Western Han dynasty (simplified Chinese: ; traditional Chinese: ; pinyin: Xi Han) or Former Han dynasty (simplified Chinese: ; traditional Chinese: ; pinyin: Qianhan) (206 BC 9 AD). During this period the capital was at Chang'an (modern Xi'an). From the reign of Guangwu the capital was moved eastward to Luoyang. The era from his reign until the fall of Han is known as the Eastern Han dynasty (simplified Chinese: ; traditional Chinese: ; pinyin: Dong Han) or the Later Han dynasty (simplified Chinese: ; traditional Chinese: ; pinyin: Hou Han) (25220 AD).

What era does the reign of Guangwu fall under?
Answer: Eastern Han dynasty
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The phenomenon known as "passing as white" is difficult to explain in other countries or to foreign students. Typical questions are: "Shouldn't Americans say that a person who is passing as white is white, or nearly all white, and has previously been passing as black?" or "To be consistent, shouldn't you say that someone who is one-eighth white is passing as black?" ... A person who is one-fourth or less American Indian or Korean or Filipino is not regarded as passing if he or she intermarries with and joins fully the life of the dominant community, so the minority ancestry need not be hidden. ... It is often suggested that the key reason for this is that the physical differences between these other groups and whites are less pronounced than the physical differences between African blacks and whites, and therefore are less threatening to whites. ... [W]hen ancestry in one of these racial minority groups does not exceed one-fourth, a person is not defined solely as a member of that group.

Who are consdered to have the most physical differences?
Answer: African blacks and whites
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There have been cases of a variety of speech being deliberately reclassified to serve political purposes. One example is Moldovan. In 1996, the Moldovan parliament, citing fears of "Romanian expansionism", rejected a proposal from President Mircea Snegur to change the name of the language to Romanian, and in 2003 a MoldovanRomanian dictionary was published, purporting to show that the two countries speak different languages. Linguists of the Romanian Academy reacted by declaring that all the Moldovan words were also Romanian words; while in Moldova, the head of the Academy of Sciences of Moldova, Ion Barbuta, described the dictionary as a politically motivated "absurdity".

Fear of what caused the Moldovan parliament to reject changing the name of the country's language to Romanian in 1996?
Answer:
Romanian expansionism