Ohio, NH, NV, ND, SD, WA and WY banned the practice in the 1860s, and many more had enacted bans by the 1920s.
The most recent state to ban cousin marriage was Texas in 2005.
The parents of parallel cousins are also siblings but are of the same sex (this chart may help explain). First cousins marrying in 21 century America discover that many states no longer regulate the practice.
In cultures where cross cousins are encouraged and parallel discouraged, it is often an inherited taboo, passed down from when there was greater inter-marriage and inter-mingling among the members of an extended family – with a greater chance that first cousins could also be half-siblings: Fathers who are also brothers may overtly or covertly share sexual relations with the wife of one or the other . Likewise, most sects of Christianity do not forbid it, which would be hard to do given cases like Isaac and Rebekah in the Book of Genesis.
In 1859, Britain took over and Bengal became part of the British Empire as a region of India.As a result the new country of Bangladesh was created in 1972.It was a parliamentary democracy with a constitution. Justice Abu Sayeed Choudhury was the first President and Sheikh Mujibur Rahman (Mujib) the first Prime Minister.In 1947, the region of Bengal was divided along religious lines.The mostly Muslim eastern half was called East Pakistan and became part of Pakistan.