Yes, that is true that they did write their own constituions.
The best and most correct answer among the choices provided by your question is the second choice or letter B "The Kansas-Nebraska Act."
The Kansas-Nebraska Act<span> was passed by the U.S. Congress on May 30, 1854. It allowed people in the territories of </span>Kansas<span> and </span>Nebraska<span> to decide for themselves whether or not to allow slavery within their borders. The </span>Act<span> served to repeal the Missouri Compromise of 1820 which prohibited slavery north of latitude 36°30´.</span>
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Although there are no elections, the following legal party exists: National Development Party (NDP).
Hassanal Bolkiah (Jawi: حسن البلقية; born 15 July 1946) is the 29th and current Sultan and Yang di-Pertuan of Brunei and the Prime Minister of Brunei. He is one of the last absolute monarchs in the world. After Queen Elizabeth II, the sultan is the world's second longest-reigning current monarch. ...
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Disease and violence from other groups