<P> Because polygamy has been illegal throughout the United States since the mid-19th century , and in many individual states before that , sources on alternative marriage practices are limited . Consequently , it is difficult to get a clear picture of the extent of the practice in the past and at the present time . </P>
<P> Because polygamy has been illegal throughout the United States since the mid-19th century , and in many individual states before that , sources on alternative marriage practices are limited . Consequently , it is difficult to get a clear picture of the extent of the practice in the past and at the present time . </P>
when did polygamy become illegal in the us
when did polygamy become illegal in the us
the mid-19th century
the mid-19th century