《汉书·传·王莽传上》
以往国家的危难，本起因于没有继承人，婚娶不当。
乃者，国家之难，本从亡嗣，配取不正。
In the past, the country's difficulties were due to the lack of heirs and improper marriage.
<s>[INST] Kindly elucidate the central themes in this passage in English: 乃者，国家之难，本从亡嗣，配取不正。 [/INST] In the past, the country's difficulties were due to the lack of heirs and improper marriage.</s>
Kindly elucidate the central themes in this passage in English: 乃者，国家之难，本从亡嗣，配取不正。
user
In the past, the country's difficulties were due to the lack of heirs and improper marriage.
assistant